Answer:
All of the following features make capillaries great for exchanging substances between the blood and cells:
The blood pressure is much lower and the flow is slower, allowing time for exchange
They are permeable and allow substances to move in and out
They have a very large total cross-sectional area for exchange
They are only one cell layer thick, which facilitates rapid diffusion of substances across their walls.
Explanation:
Which system has to do with skin, hair, and nails?.
Answer: The Integumentary system
Explanation:
:)
Please help me ;(
Match each system of equations with the constant that can be multiplied by equation A to create a system of equations that can be solved using the linear combination method.
Equation A: 3x – 2y = 5
Equation B: 9x + 7y = –34
Equation A: 3x – 4y = 5
Equation B: 7x + 8y = 4
Equation A: 13x – y = 51
Equation B: 12x + 3y = –90
To solve a system of equations using the linear combination method, the goal is to eliminate one variable by adding or subtracting the equations.
To do this, we need to find a constant that can be multiplied to one of the equations so that the coefficients of one variable will be the same or opposite in both equations.
For the first system, if we multiply equation A by 3, we get 9x - 6y = 15, which can be added to equation B to eliminate the y-variable. Thus, the constant for this system is 3.
For the second system, multiplying equation A by 2 gives 6x - 8y = 10, which can be added to equation B to eliminate the y-variable. Therefore, the constant for this system is 2.
For the third system, if we multiply equation A by 3, we get 39x - 3y = 153, which can be added to equation B to eliminate the y-variable. Thus, the constant for this system is 3.
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What happened to the deer population since the wolves have returned?
Answer:
They were eaten by them (wolves).
Explanation:
According to the food chain, wolves eat deers, therefore the deer population will decrease. But that isnt the case, it can be balanced or not. Balanced is when there is an equal amount of animals, in the food chain. and the vice versa for not.
sally wants to lose weight by only eating rice for all her meals. explain why is not advisable for her to do so for a prolonged period time
The enzyme
dna polymerase
reassembles the newly copied dna molecules.
the enzyme
helicase
"reads" the original dna strand.
Enzyme "DNA polymerase" reconstructs newly copied DNA strands, while "helicase" unwinds the original DNA strand during replication.
An important role in DNA replication is played by the enzyme DNA polymerase, which adds complementary nucleotides to the template strand to form a new DNA strand. It guarantees purity and thoroughly checks the process. The double-stranded DNA molecule must unwind in order for the two strands to separate and form a replication fork, but helicase is also necessary to do this.
This makes it possible for DNA polymerase to function effectively. The unwinding process requires energy, which is done by breaking hydrogen bonds between base pairs. In order to transfer genetic information from one generation to the next, reliable DNA replication is essential, and both enzymes play important roles in the complex machinery that makes this possible.
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Your question is incomplete, most probably the complete question is:
The enzyme DNA polymerae reassembles the newly copied dna molecule while the enzyme helicae "reads" the original dna strand.
The most important factor in determining attraction is usually physical attraction
True, the most important factor in determining attraction can vary for different individuals; however, physical attraction is often a significant element.
It involves being drawn to someone's appearance or physical features, which can serve as an initial catalyst for further exploration of compatibility, such as shared values, interests, and personality traits. Remember, attraction is subjective and can be influenced by various factors.
Physical Attraction as an Initial Catalyst: Physical attraction refers to the instinctive or immediate appeal one feels towards someone based on their physical appearance or features.
It serves as an initial catalyst that sparks interest and draws individuals towards each other. The visual aspect of physical attraction can evoke feelings of admiration, desire, and curiosity.
Initial Impressions: Physical appearance is often the first aspect of a person that we notice and evaluate. Factors such as facial symmetry, body proportions, attractiveness of features, grooming, and overall physical health can influence our perception of someone's attractiveness.
These initial impressions can create a baseline attraction that motivates individuals to explore further connections and interactions.
Individual Variation: It is important to recognize that what is considered physically attractive can vary greatly between individuals due to personal preferences, cultural influences, and societal standards.
Beauty ideals can differ across cultures, and individuals may have their own unique preferences shaped by personal experiences, upbringing, and media influences.
Beyond Physical Attraction: While physical attraction can serve as the initial spark, it is important to note that it is not the sole determinant of long-term compatibility or relationship satisfaction.
As individuals get to know each other, other factors such as shared values, interests, personality traits, emotional connection, and communication become increasingly important in forming deeper connections and maintaining relationships.
Subjectivity and Influencing Factors: Attraction is highly subjective and can be influenced by various factors beyond physical appearance. Cultural, social, and psychological factors all play a role in shaping individual preferences and perceptions of attractiveness.
Personal experiences, past relationships, and individual aspirations also contribute to what individuals find appealing.
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The most important factor in determining attraction is usually physical attraction. Is this statement true or false?
Can anyone write down what the handwriting says?? I can’t read some parts of it
To maintain homeostasis, materials have to move across cell membranes. Some examples of these movements are listed below.
1. Amoeba consuming a bacterium
2. Somatic cell absorbing cholesterol from the blood
3. Brain neuron taking up glucose from the blood
4. Paramecium absorbing water from its surroundings
5. Pancreatic cell secreting insulin into the blood
Which three processes require the cell to spend energy?
A. 1, 2 and 5
B. 1, 3 and 5
C. 2, 3 and 4
D. 3, 4 and 5
Answer:
The three processes that require the cell to spend energy are typically those that move materials against their concentration gradient or require the cell to perform active transport. Based on this criteria, the correct answer is:
B. 1, 3 and 5
Explanation:
1. Amoeba consuming a bacterium requires energy as the cell engulfs the bacterium using its cell membrane.
2. Somatic cell absorbing cholesterol from the blood requires energy as the cell needs to move the cholesterol against its concentration gradient.
3. Brain neuron taking up glucose from the blood requires energy as the glucose needs to be transported against its concentration gradient.
Processes 4 and 5 do not require the cell to spend energy as the paramecium simply absorbs water from its surroundings (which is a passive process), and pancreatic cell secreting insulin into the blood is a facilitated diffusion process.
In the 1950's, chemists stanley miller and harold urey experimented to find out if organic molecules could have formed on early earth. because they published their work, other scientists have been able to modify it to reflect more current knowledge, and have produced similar results. what did miller and urey produce?
Miller and Urey produced amino acids, which are the building blocks of proteins, in their famous experiment conducted in the 1950s.
They aimed to simulate the conditions of early Earth in a laboratory and demonstrated that simple organic molecules, such as amino acids, could be formed from inorganic compounds such as water, methane, ammonia, and hydrogen, in the presence of energy sources such as electric sparks that mimic lightning.
The experiment provided strong evidence that the basic building blocks of life could have originated on early Earth under the right conditions.
The Miller-Urey experiment was groundbreaking because it provided a scientific basis for understanding the origin of life on Earth.
Since then, the experiment has been repeated with modifications to reflect more accurate knowledge about the conditions on early Earth, and similar results have been obtained.
The experiment also led to the development of the field of astrobiology, which studies the origin, evolution, and distribution of life in the universe.
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The coracobrachialis muscle shares a common attachment with the:.
The coracobrachialis muscle is a small, triangular muscle located in the upper arm that has a common attachment with other muscles and bones in the shoulder joint.
Specifically, it shares a common attachment with the coracoid process of the scapula and the humerus bone in the arm. The coracoid process is a bony protrusion located on the scapula that provides attachment sites for several muscles, including the coracobrachialis.
The coracobrachialis muscle then extends downward to attach to the humerus bone near the middle of the arm. This muscle plays a role in arm flexion and adduction, and is innervated by the musculocutaneous nerve.
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Classify the terms as most closely related to either an ecosystem or a community.
An ecosystem and a community are closely related terms. An ecosystem is a collection of living and non-living components that interact with each other.
It includes things like plants, animals, sunlight, soil, water, and climate. A community is a group of living organisms that interact with each other, and their environment. Communities can be made up of different species, such as plants, animals, and fungi.
A key difference between an ecosystem and a community is that an ecosystem is a self-sustaining system, while a community is a group of organisms that live together and interact with each other.
In an ecosystem, the living and non-living components interact with each other in a balanced way. A community, on the other hand, is a group of living organisms that interact with each other and their environment.
In summary, an ecosystem is a self-sustaining system that includes living and non-living components, while a community is a group of living organisms that interact with each other and their environment. Both ecosystems and communities are vital components of the environment, and they play an important role in maintaining a healthy planet.
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Xander's friend, Pablo, accelerates on his scooter at 1.2 m/s2 using a force of 40 newtons.
What is the mass of Pablo and his scooter?
Pablo accelerates his scooter at 1.2 m/s² using a force of 40 newtons. So the mass of Pablo and his scooter is approximately 33.33 kg.
We may use Newton's Second Law of Motion to compute the mass of Pablo and his scooter, which states that the force applied to an object is equal to the item's mass multiplied by its acceleration (F = ma).
In this scenario, we know that Pablo's force on his scooter is 40 newtons, and the scooter's acceleration is 1.2 m/s². Now we may modify the equations to find Pablo's and his scooter's mass (m):
m = F/a
when we substitute the values we have, we get:
m = 40N / 1.2m/s²
m = 33.33kg
As a result, Pablo and his scooter weigh around 33.33 kg.
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When cells in an embryo start to become different types of cells; example, cells start to become heart/brain/skin/etc. cells
Is it meiosis, mitosis, or differentiation???
Answer:
The process you describe is known as differentiation. Cells become specialised and take on specific activities in the body during differentiation. Cell division occurs in both meiosis and mitosis.
I need help with filling in the boxes
Just put how each limiting factor can impact the native population
Don’t send the link that just hacks you :/
someone please answer!!!
Limiting factors have a significant impact on a population's ability to survive and thrive. These factors can range from food availability and competition with other species to disease and habitat destruction.
All of these factors can cause a decline in the native population, particularly if they are not addressed in a timely manner.
Food availability is a major limiting factor on a species’ ability to survive. If a species is unable to find enough food, they may not be able to reproduce and their population numbers could decline.
Additionally, competition with other species can limit the availability of resources and lead to a decrease in the native species’ population. Disease can also take a toll on a population, as it can spread quickly and be difficult to control. Finally, habitat destruction can also have a drastic effect on a species’ population, as it can lead to a loss of food sources and suitable habitat for reproduction and growth.
Overall, limiting factors can have a significant impact on native populations, leading to decreased numbers if not addressed appropriately. It is important to take these factors into account when assessing the health of a species, as they can have disastrous effects on the population if not managed properly.
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How is thermal energy within the earths layers of related to some of its natural disasters
Thermal energy within Earth's layers is related to some natural disasters, such as volcanic eruptions and earthquakes.
The Earth's interior contains significant heat, which is generated by radioactive decay and residual heat from the planet's formation. This thermal energy drives plate tectonics, which is the movement of Earth's lithosphere.
Volcanic eruptions occur when magma, generated by the melting of Earth's mantle due to thermal energy, rises to the surface. This process can result in explosive eruptions and lava flows, causing widespread damage and posing risks to human life.
Earthquakes, on the other hand, are often caused by the movement of tectonic plates, driven by the same thermal energy.
As plates move, they interact with each other, leading to the buildup of stress along faults. When this stress is released, it generates seismic waves, resulting in an earthquake.
In conclusion, thermal energy within Earth's layers plays a crucial role in driving natural disasters like volcanic eruptions and earthquakes by influencing the movement of tectonic plates and the generation of magma.
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The mechanism by which the end product of a metabolic pathway inhibits an enzyme that catalyzes an earlier step in the pathway is most precisely described as Group of answer choices feedback inhibition cooperativity inhibition irreversible inhibition competitive inhibition
The mechanism by which the end product of a metabolic pathway inhibits an enzyme that catalyzes an earlier step in the pathway is most precisely described as feedback inhibition. The correct answer is option a.
Feedback inhibition is a regulatory mechanism that allows a cell to control the rate of a metabolic pathway by using the end product of the pathway as a signal to inhibit an earlier enzyme in the pathway. This inhibition reduces the rate of the pathway and prevents the accumulation of excess products.
Feedback inhibition is a type of reversible inhibition, which means that the inhibition can be relieved if the concentration of the end product decreases or if a different signal overrides the inhibition.
This is in contrast to irreversible inhibition, which permanently inactivates the enzyme, or competitive inhibition, which occurs when a molecule similar to the substrate binds to the active site of the enzyme and prevents the substrate from binding.
So, the correct answer is option a.
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The question is:
The mechanism by which the end product of a metabolic pathway inhibits an enzyme that catalyzes an earlier step in the pathway is most precisely described as
a) feedback inhibition
b) cooperative inhibition
c) irreversible inhibition
d) competitive inhibition
2. A species of wasp dies out in a prairie ecosystem. This species used to perform the important task of pollinating a widespread plant species. D This ecosystem will be less damaged by this local extinction if A. Most of the large animal species depend on the plant for food. B. The plant species also dies out. C. The wasp species is still successful in other ecosystems. D. There are other insect species that also pollinate the plant
There are other insect species that also pollinate the plant. Even though the specific wasp species that used to perform the important task of pollinating a widespread plant species is now extinct, there are likely other insect species in the prairie ecosystem that can perform the same task. The correct answer to this question is D.
This is because pollination is often carried out by multiple species of insects, and the loss of one species is not necessarily catastrophic for the ecosystem. Additionally, if most of the large animal species depend on the plant for food, then the loss of the wasp species could indirectly affect those animals as well.
Similarly, if the plant species also dies out, then the entire ecosystem could be impacted. Therefore, the most reasonable and optimistic scenario is that there are other insect species that also pollinate the plant, which can compensate for the loss of the wasp species and ensure that the prairie ecosystem remains relatively stable.
So, The correct answer to this question is D.
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Can you describe scenarios where a) anatomical or b) behavioral differences between
grizzlies and early polar bears may have been premating or postmating isolating
mechanisms?
In scenarios involving premating or postmating isolating mechanisms, anatomical and behavioral differences between grizzlies and early polar bears can play a role in preventing interbreeding.
a) Anatomical differences: Early polar bears and grizzlies have distinct physical traits that could act as isolating mechanisms. For example, polar bears have a more elongated body and a longer neck, adapted for hunting seals in their Arctic habitat.
Grizzlies, on the other hand, have a more robust body for foraging and hunting in forests and plains. These anatomical differences might result in decreased attraction or compatibility between the two species, leading to premating isolation.
b) Behavioral differences: Grizzlies and early polar bears also have different mating behaviors and habitat preferences that can act as isolating mechanisms.
Polar bears typically mate on sea ice, while grizzlies mate in terrestrial environments. Additionally, the two species may have different mating seasons, calls, or courtship rituals.
These behavioral differences can lead to both premating and postmating isolation, as individuals from each species may not encounter each other during mating or successfully reproduce if they do mate.
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Which from the list below can affect the rate of a reaction? (Choose all that apply).
Group of answer choices
heat
light
buffers
enzymes
temperature
The rate of reaction is the speed at which a reaction occurs, and depends on enzymatic activity, which is limited by temperature and pH. Option E. Temperature is the factor that affects the rate of a reaction.
What is the rate of reaction?
When talking about the rate of reaction we refer to the speed at which a chemical reaction occurs, turning reactants into products.
It can be measured as
the concentration of reactant consumed in a certain timethe concentration of product formed during the same time.The rate of reaction depends on the reactant concentration and on enzyme concentration.
Enzymatic activity is limited by pH and temperature. Every enzyme has an optimum pH and temperature level at which their activity is the highest.
Over this point the enzyme denaturalizes and loses its functions. Bellow this point, the enzyme has not reached its maximum activity.According to this framework, temperature is the one that affects the rate of a reaction. Option E.
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The somatic and autonomic reflex pathways both consist of three neurons. Choose the three neurons that apply to the somatic reflex ONLY. A. Interneuron B. Post-Ganglionic neuron C. Sensory neuron D. Motor neuron E. Pre-Ganglionic neuron
The 3 neurons that apply the somatic reflex are
sensory neuroninterneuronmotor neuronThe function of the sensory neuron is to carry information and data from the receptor to the spinal cord.
The interneuron is present in the spinal cord and is connected to the sensory neuron with the help of a motor neuron.
The motor neuron helps to carry data and information from the spinal cord to an effector, hence presenting a response.
A somatic reflex refers to the that is involuntary stimulus received from the external environment. For this process to be dynamic the responses from the receptors directly transfer the signals to directly to the spinal cord.
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Is genetic engineering a boon or bane? Defend your answer
Genetic engineering can be viewed as both a boon and a bane, depending on its applications and implications.
Genetic engineering has the potential to bring about numerous benefits. It allows for the development of genetically modified organisms (GMOs) with enhanced traits, such as disease resistance or increased crop yield, which can contribute to food security and agricultural sustainability. Genetic engineering also plays a crucial role in medical advancements, including the production of life-saving drugs and the potential for gene therapies to treat genetic disorders.However, there are also concerns and risks associated with genetic engineering. Unintended consequences and ecological impacts of GMOs on biodiversity and ecosystems need careful consideration. Ethical concerns arise regarding the modification of human germline cells, raising questions about the potential for eugenics and the long-term effects on future generations.To determine whether genetic engineering is a boon or bane, it is essential to evaluate its applications on a case-by-case basis, considering scientific, ethical, and societal factors. Striking a balance between the benefits and risks through comprehensive regulation, transparency, and public engagement is crucial to harnessing the potential of genetic engineering for the greater good while minimizing potential negative consequences.
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John raises goldfish as a pet dealer. He has over 10,000 fish in one large tank but, due to an electrical problem, 95 percent of the fish perish one night. The remaining 5 percent are left to breed and repopulate, passing their genes and traits on to future generations. What type of genetic drift would this be considered?
The type of genetic drift that would occur in this scenario is known as a bottleneck effect.
This is because a large proportion of the population (95 percent) has suddenly been removed, leaving only a small percentage (5 percent) to repopulate the tank. As a result, the remaining fish will have a much lower genetic diversity than the original population, and some traits that were present in the original population may be lost completely.
The bottleneck effect is a type of genetic drift that can occur when a population experiences a dramatic reduction in size. It can be caused by a range of events, such as natural disasters, disease outbreaks, or human activities like overhunting. The resulting population is likely to be genetically different from the original population due to chance events that occur during the process of reproduction and survival.
In the case of John's goldfish tank, the bottleneck effect would result in a population of goldfish that is genetically different from the original population. The traits that are present in the remaining fish may become more common in future generations, while other traits may be lost. This can have implications for the health and survival of the population, as well as its ability to adapt to changing environmental conditions.
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You and a friend walked by a tree with grass growing your friend states that the tree is larger than the grass because it's closer to the Sun and is able to take and more material do you agree
No, I do not agree with my friend's statement. Trees and grass both rely on the Sun for energy, but the amount of energy each absorbs depends on their size.
Trees are larger than grass, so they are able to absorb more energy from the Sun. However, the distance between the Sun and the tree does not affect the amount of energy absorbed by the tree. The amount of energy absorbed by the tree depends on the surface area of its leaves, not the distance between the Sun and the tree.
Additionally, the amount of energy absorbed by the grass is much more affected by the distance between the Sun and the grass than the tree because the difference in size between the grass and the Sun is much greater.
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Explain, using complete sentences, the trend in levels of blood glucose from 11:00 a. M. To 10:00 p. M.
In your answer use the following terms:
[Feedback mechanism] [stimulus] [response] [positive or negative]
The trend in levels of blood glucose from 11:00 a.m. to 10:00 p.m. can be explained using the feedback mechanism of homeostasis.
A steady internal environment is what the body is able to maintain through a number of feedback processes, which is known as homeostasis. Insulin and glucagon are the two hormones that control blood glucose levels. Glucagon raises blood glucose levels whereas insulin lowers them.
After breakfast, about 11:00 a.m., blood glucose levels rise as a result of the meal's carbs. Insulin is then released by the pancreas in response, assisting the body's cells in absorbing glucose from the bloodstream. Blood glucose levels consequently start to drop.
The feedback system of homeostasis continues to control blood sugar levels throughout the day. Insulin is secreted to lower blood glucose levels whenever they are too high. Glucagon is secreted to boost blood glucose levels when they fall too low.
Due to the stimulus of food and the body's reaction to it, blood glucose levels are normally lower by 10:00 p.m. after dinner than they were at 11:00 a.m. The body has the energy it needs to function effectively thanks to the feedback system of homeostasis, which has helped to keep blood glucose levels consistent throughout the day. Overall, this feedback mechanism is negative, reversing any departures from the set point in order to maintain a steady internal environment.
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Humans are a type of ___ mammal, having and organ that provides nutrients to the developing offspring.
Humans are a type of placental mammal, having an organ called the placenta that provides nutrients to the developing offspring.
Placental mammals, also known as Eutherians, are a diverse group of mammals that give birth to live young, which develop inside the mother's body. The placenta is a temporary organ that attaches to the uterine wall and allows for the exchange of oxygen, nutrients, and waste products between the mother and the developing fetus. This organ is vital for the survival and development of the fetus, providing a constant supply of nutrients and oxygen while also removing waste products.
Placental mammals make up the majority of all mammal species and include a wide range of animals such as dogs, cats, elephants, and humans. The placenta is a unique feature of this group of mammals and is one of the key adaptations that have allowed them to evolve and thrive in a variety of environments.
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What cells found in nervous tissue function in a supportive role only, supplying growth factors and nutrients to other resident tissue cells
Supportive cells found in nervous tissue supply growth factors and nutrients to other resident tissue cells.
These cells, known as glial cells, are divided into several categories, including oligodendrocytes, astrocytes, microglia, and ependymal cells. Oligodendrocytes provide insulation for axons by creating a fatty sheath around them known as myelin, which helps signals travel quickly along the axon.
Astrocytes are the largest and most numerous of the glial cells and play a variety of roles. They provide support to neurons by supplying them with nutrients, clearing away waste, and forming connections between neurons. Microglia act as the immune cells of the central nervous system, surveying the environment for signs of injury or infection.
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You are a science student completing an outline to guide you in conducting an experiment. You create a main topic
called Equipment. You create subtopics for this main topic named Bottles, Scale, and Safety Glasses. Which outline step
are you performing?
labeling
ordering
O brainstorming
o organizing
The outline step you are performing is organizing. Therefore, option (D) is correct.
The outline step being performed in this scenario is organizing. Organizing involves structuring and arranging the subtopics in a logical order within the main topic. In this case, the main topic is "Equipment," and the subtopics are "Bottles," "Scale," and "Safety Glasses."
By creating these subtopics, the science student is organizing the different components of the equipment they will be using for their experiment. This step helps to provide a clear and organized framework for the experiment, allowing the student to easily identify and address each aspect of the equipment they will need to consider and discuss.
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which of the following statements is correct? topographical occlusal radiographs yield a greater amount of information in the alveolar crest and apical areas than periapical radiographs. topographical occlusal radiographs may be exposed only on the maxillary arch. cross-sectional occlusal radiographs work best to image the maxilla. topographical occlusal radiographs cannot be used on children.
The correct statement is: Topographical occlusal radiographs yield a greater amount of information in the alveolar crest and apical areas than periapical radiographs therefore the correct option is A.
Topographical occlusal radiographs are special type of X-ray which allow the dentist to view an image of the entire mouth, including both structural and functional relationships between teeth, as well as any abnormalities or changes. The topographical technique focuses on a limited area of interest, such as a single tooth or few teeth,
and produces an image that shows detailed contours relating to that particular location. It can identify changes in the contour of the occlusal surface, which may reflect trauma or wear. It also helps to detect caries and other dental diseases related to wear and tear.
Hence the correct option is A.
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In Africa, elephant populations have declined due to poaching, which is illegally hunting elephants for their tusks. In the past, only about two percent of female elephants were born tuskless. A recent study found that 98 percent of the 174 female calves born in one national park had no tusks. Which of the following statements is supported by this mathematical representation?
A. Elephants without tusks are surviving and reproducing while elephants with tusks are not.
B. Elephants no longer need tusks because their habitats have been changing.
C. Female elephants do not need tusks to successfully rear their young.
D. Male elephants are growing tusks more quickly than female elephants are.
Natural selection selects beneficial alleles and and phenotypes, and increases their frequency in the population. Option A. Elephants without tusks are surviving and reproducing while elephants with tusks are not.
What is natural selection?
Natural selection is an evolutive force that favors an allele or act against it, depending on how the allele affects the fitness of individuals. It selects beneficial alleles and increases their frequency in the population.
The phenotype that expresses the best fitness results in higher survival, fertility, and reproductive rates. Aptitude -fitness- must be significant to the natural selection act in its favor.
Adaptation, acchieved by natural selection, is closely related to selective pressures.
Selective pressure is applied by different organisms or conditions that influence the survival rate of a certain phenotype. It influences the probability of a genotype leaving its gametes to the following generations.
In the exposed example,
Selective pressure ⇒ poachingoriginal phenotype ⇒ tuskednew phenotype ⇒ tusklessBeing tuskless increased the individuals' fitness so natural selection favored this new phenotype and increased its frequency in the population.
Option A. Elephants without tusks are surviving and reproducing while elephants with tusks are not.
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A zygote has implanted itself in the uterine wall. This signifies the end of the _____ stage of development and the beginning of the _____ stage.
Answer:
germinal, embryonic
Explanation:
i just know
