Answer:
Although the evidence for a protective role of B cells and antibodies has been noted, the direct contribution of CD4+ T cells in protection against blood stages beyond a helper function for CD4+ T cells has mainly derived from rodent models of malaria.
How did different skin colors evolve in humans?
Skin colors evolve in humans as an adaptive feature to the amount of solar radiation in a given latitude.
What is adaptation?Adaptation is a given phenotypic feature that confers an advantage to the individual in particular environmental conditions.
Apadtations are selected by natural selection, which means that they exhibit differential survival and/or reproduction rates.
In conclusion, skin colors evolve in humans as an adaptive feature to the amount of solar radiation in a given latitude.
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what is an accurate description of an ecosystem
Answer:
An ecosystem (or ecological system) consists of all the organisms and the physical environment with which they interact.
Explanation:
Hope it Helps!!!
1. Define Isogamous with example.
2. Define Anisogamous with example.
3. Define Oogamous with example.
Answer:
1. Having two similar gametes in which no differentiation can be distinguished, or reproducing by the union of such gametes.
e.g. in Spirogyra and Ulothrix
2. Anisogamy refers to a type of sexual reproduction in which two dissimilar gametes unite or fuse. The gametes may differ in size or form.
Example : human beings, the male gamete sperm is smaller and motile while the female gamete egg is non motile and larger.
3. having or involving a small motile male gamete and a large immotile female gamete.
E.g. Volvox, Fucus
Question 11 of 30
Which of the following factors affecting population growth is density
independent?
Answer:Density-independent limiting factors affect all populations the same, regardless of population size. Density-dependent limiting factors include disease, parasites, competition for food, water, and shelter, and predation. Density-independent limiting factors include natural disasters, climate, and human activity.
Explanation:
A. Point Source
B. Non-Point Source
This would be
considered what
type of water
pollution?
The given scenario would be considered "Point Source" water pollution.
Point source water pollution refers to the contamination of water bodies that can be traced back to a specific, identifiable source or location. This type of pollution occurs when pollutants are discharged directly into water bodies through pipes, drains, or other identifiable outlets.
These sources can include industrial facilities, wastewater treatment plants, oil spills, or sewage systems. Point source pollution is relatively easier to monitor and control because the source is identifiable, allowing for targeted measures to reduce or eliminate the pollution.
In contrast, non-point source pollution refers to pollution that is more diffuse and comes from multiple, widespread sources, such as agricultural runoff, urban runoff, or atmospheric deposition.
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Place the following statements in the correct order in the blanks below to describe how gas
exchange occurs in the leaf. Make sure you include how the gas enters, and how it exits
the leaf. Some statements may be used more than once.
a. Diffuses into air pockets
b. Diffuses into palisade cells
c. CO2(g) is converted into O2(g)
d. Diffuses through spongy tissue layer
e. Moves through open stomata
____ ____ ____ ____ ____ ____ ____ ____ ____
The correct order in the blanks is as follows E D C E A B A C E
Moves through open stomata diffuses through spongy tissue layer CO2(g) is converted into O2(g). Moves through open stomata diffuses into air pockets and diffuses into palisade cells. Diffuses into air pockets CO2(g) is converted into O2(g) moves through open stomata.
What is photosynthesis?
Plants use sunlight, water, and carbon dioxide to produce oxygen and energy in the form of sugar in a process known as photosynthesis.
When performing photosynthesis, plants utilize the ambient carbon dioxide and release the oxygen gas they create into the atmosphere. Gas exchange is the term for this. Stomata, a unique part of the plant's leaf, are used to accomplish this. The guard cells that surround the stomata become turgid or flaccid in response to the entry or escape of water molecules, respectively. Stomata open and gas exchange occurs when the guard cells become turgid, or the other way around.
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A botanist scrapes pollen off of one plant and then use it to pollinate the flower of another plant . What can scientifically conclude about other offspring
A botanist scrapes pollen off a flower of one plant and then uses it to pollinate the flower of another plant. What can be scientifically concluded about their offspring?
A. They will have a large amount of genetic variation.
B. They will have twice the number of chromosomes as their parents.
C. They will be genetically distinct from their parents.
D. They will be able to reproduce only asexually.
Plants' xenogamous system has high probabilities of introducing genetic variation between plants. Option A) They will have a large amount of genetic variation.
What are the crossing systems in plants?There are two general crossing systems in plants, which depend on pollination type.
Self-pollination occurs when the flower pollen is transferred to the same flower stigma, reaching that individual egg to fertilize it. These are autogamous systems. Crossed pollination occurs when the mature pollen is driven by different pollinator agents from one flower to another, reaching the other flower stigma and fertilizing its eggs. These are xenogamous systems.
Sexual reproduction gives more possibilities to different alleles of a gene that did not appear in one generation to express in the next generation.
Both types of pollination allow genetic variation, however by the occurrence of crossed pollination there are more chances to ensure the variability of the species and survival to environmental changes.
While by self-pollination there are more chances to express the same genotype of the parental plant.
The Xenogamous system has the advantage of avoiding the effects of endogamy in a population by increasing genetic variability.
In the exposed example, the botanist is acting as the pollinator agent, allowing one plant's pollen grain to fertilize the egg of the other plant.
The merging of these gametes will introduce variation since there will new allelic combinations.
The correct option is A). They will have a large amount of genetic variation.
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In adult circumcision, a ________ incision is made in the skin and carried circumferentially.
During adult circumcision, a dorsal incision is made in the skin of an individual and carried circumferentially.
What is circumcision?Circumcision can be defined as a surgical procedure that involves a removal of the foreskin from the pe-nis (genital) of a male organism, especially at infant stage.
Based on medical information, a dorsal incision is made in the skin of an individual and carried circumferentially during the removal of the foreskin from the pe-nis (genital) of an adult (adult circumcision).
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What form of natural selection does the histogram show?
disruptive selection
sexual selection
directional selection
stabilizing selection
The form of natural selection does the histogram show is disruptive selection.
What is a disruptive choice on a graph?In disruptive choice, choice pressures act on people withinside the center of the trait distribution. The end result is a bimodal, or -peaked, curve wherein the 2 extremes of the curve create their personal smaller curves.
Disruptive choice produces a populace that has severe variations of a trait because the dominant phenotype. For example, if each brief and tall organisms, however now no longer medium top organisms have been preferred this will be disruptive choice in action.
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Which of the following describes a limiting factor of population size?
A. Birth rate
B. Death rate
C. Gestation
D. Water availability
What are the defining characteristics of lobe-finned fishes?
Lobe-finned fishes are characterized by lobes in their fins in addition to the basic characteristics of fishes.
What are lobe-finned fishes?Lobe-finned fishes are a group of fish known as Sarcopterygii. They possess the basic characteristics of fishes such as swim bladder, lateral lines, etc.
They are a sister group of ray-finned fishes. In addition, lobe-finned fishes possess the following characteristics:
lobed finsenameled teethMore on lobe-finned fishes can be found here: https://brainly.com/question/7849168
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Which of these is a negative form of a plant tropism?
Answer:
Gravitropism is a common example which can be used to describe negative tropism.
Gravitropism is an example.
When a plant grows upwards and is defying gravity.
Therefore, it is negative gravitropism.
Which is an abiotic factor that can be found in a rain forest ecosystem?
Answer:
rainfall
Explanation:
there is a high rate of rainfall in rainforest, therefore amount of rain fall being abiotic factor can affect rain forest
why does ventricular tachycardia cause syncope
Tachycardias, or extremely rapid heartbeats, can cause syncope. Examples include supraventricular tachycardia (SVT) and ventricular tachycardia.
Tachycardia and how it causes syncope
The lower chambers (ventricles) are where ventricular tachycardia starts and it is extremely rapid. Ventricular tachycardia may not be problematic if it lasts only a few seconds. However, persistent ventricular tachycardia might drop blood pressure, which can cause syncope (fainting) or dizziness.To learn more about tachycardia and syncope, refer to-
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the enzyme pgh synthase contains two different functionalities, a __________ that uses two molecules of oxygen as substrates and __________ which performs a 2 electron reduction.
The enzyme PGH synthase contains two different functionalities, a cyclooxygenase that uses two molecules of oxygen as substrates and peroxidase.
What is PGH synthase?Prostaglandin-endop_eroxide synthase 2 (PGH) is an enzyme that has catalytic activity as peroxidase.
A peroxidase enzyme is a catalyst that converts peroxide which is very reactive to oxygen and water.
In conclusion, the enzyme PGH synthase contains two different functionalities, a cyclooxygenase that uses two molecules of oxygen as substrates and peroxidase.
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which structure is most likely found in green plants
Which trait is most likely to be selected in the population of plants growing in this region of the desert?
The ability to limit water transport and to conserve it is the feature most likely to be chosen in the plants growing in the desert.
Since the plants in desert regions are tiny, have deep roots, and have a thick, which also helps to keep the plants cool and slows evaporation, they lose less water and are more effective in hot temperatures like deserts. Animals cannot consume the majority of desert plants because they have. As a result of cactus and aloe vera flourishing in this area of the desert, The flora is frequently seen in deserts.
So The ability to limit water transport and to conserve it is the feature most likely to be chosen in the plants growing in the desert
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EASYYYY I WILL MARK BRAINLY
Worldwide, what percentage of human water usage is the result of agricultural activity? What are some of the ways water is used in industry?
Answer:
70% fresh water is used for agriculture According to the United States Geological Survey (USGS), industrial water is used for fabricating, processing, washing, diluting, cooling, or transporting a product. Water is also used by smelting facilities, petroleum refineries, and industries producing chemical products, food, and paper products.
Answer:
In most regions of the world, over 70 percent of freshwater is used for agriculture. By 2050, feeding a planet of 9 billion people will require an estimated 50 percent increase in agricultural production and a 15 percent increase in water withdrawals.
Explanation:
Water is a critical input for agricultural production and plays an important role in food security. Irrigated agriculture represents 20 percent of the total cultivated land and contributes 40 percent of the total food produced worldwide.
which statement accurately compares the tundra and the desert
Answer:
C is the correct answer
Explanation:
C
What plants have stems that grow along the ground
[tex]\huge\purple{Hi!}[/tex]
watermelon, strawberry, pumpkin and sweet potatoes plants have stems that grow along the ground.
Eukaryotes such as animal and plants cells differ from prokaryotes in that prokaryotes.
Eukaryotes such as animal and plant cells differ from prokaryotes in that prokaryotes do not have either organelles or cell nuclei.
What are prokaryotes?Prokaryotes are microorganisms characterized due they do not have organelles or cell nuclei.
Conversely, eukaryotes contain their genetic material compartmentalized into a cell nucleus.
In conclusion, Eukaryotes such as animal and plant cells differ from prokaryotes in that prokaryotes do not have either organelles or cell nuclei.
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Why do scientists refer to inputs and outputs of carbon in the environment as a cycle?
Answer:
Carbon flows between each reservoir in an exchange called the carbon cycle, which has slow and fast components. Any change in the cycle that shifts carbon out of one reservoir puts more carbon in the other reservoirs. Changes that put carbon gases into the atmosphere result in warmer temperatures on Earth
Explanation:
hope this answer helps you
It is important for the scientists to refer to inputs and outputs of carbon in the environment as a cycle as carbon continuously flows through these systems in the environment and it is a major biogeochemical cycle.
What is Carbon cycle?Carbon cycle is a major biogeochemical cycle. It involves the flow of Carbon between each reservoir present in the environment in an exchange, which has both slow and fast components. Any change in the carbon cycle shifts carbon out of one reservoir and puts more carbon into the other reservoirs. Changes that put carbon gases into the atmosphere results into warmer temperatures on planet Earth.
Carbon flows into stores that are called inputs, e.g. carbon dioxide added to the atmosphere by human activities such as respiration and pollution. Flows leaving stores are outputs, e.g. dissolved carbon carried from the land in solution by the rivers.
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What is the pressure in mm hg of a 0.025 mole sample of co2 at 350 k in a 2.00 l container? report your answer to the nearest mm hg
The pressure in mmHg of a 0.025 mole sample of CO2 at 350 k in a 2.00L container is 273.6 mmHg.
How to calculate pressure?The pressure of a gas can be calculated using the following expression:
PV = nRT
Where;
P = pressureV = volumen = number of molesR = gas law constantT = temperatureP × 2 = 0.025 × 0.0821 × 350
2P = 0.72
P = 0.72/2 = 0.36atm
Therefore, the pressure in mmHg of a 0.025 mole sample of CO2 at 350 k in a 2.00L container is 273.6 mmHg.
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What are the products of Anaerobic Respiration in yeast?
The products of anaerobic respiration in yeast are carbon dioxide and ethanol.
Anaerobic respirationThis refers to respiration in the absence of oxygen.
In the absence of oxygen, both the citric acid cycle and the electron transport chain cannot proceed. Thus, only glycolysis takes place.
The two pyruvate molecules produced in anaerobic respiration in yeast are converted to ethanol, instead.
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Survivorship types cab be gaphed to depict survival percentages over time. Examine four graphs below: (graph in the picture )
which curve on the graph represents a species that produces high numbers of offspring with paternal care?
A. Graph 1
B. Graph 2
C. Graph 3
D. Graph 4
Graph 3 shows a species that produces high numbers of offspring with paternal care.
What is the survivorship curve?The survivorship curve gives us a idea of the number of individuals in the population that are expected to survive and reproduce at any given time. We have to note that paternal care increases the chances of survival of the organism.
Hence, graph 3 shows a species that produces high numbers of offspring with paternal care.
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what is the largest bone in the human body?
Answer:
Femur bone
Explanation:
Answer is femur bone
I contain most of the cell that perform photosynthesis. who am I?
Answer:
chlorophyll
Explanation:
Question 7: What conclusions can you make about how a change in the condition of the ocean affects the different species in coral reefs?
In a certain population of rabbits, the allele for brown fur is dominant over the
allele for white fur. If 20 out of 100 rabbits have white fur, what is the allele
frequency for the dominant allele?
based on sex assigned at birth, women tend to reach higher bac levels more quickly than men because:
Women tend to reach higher bac levels more quickly than men because they have lower levels of the enzyme alcohol dehydrogenase.
What is BAC levels?BAC levels refers to the blood alcohol levels.
Women tend to reach higher BAC levels than men.
The enzyme alcohol dehydrogenase is responsible for the metabolism of alcohol.
Women generally have lower levels of the enzyme in their body and thus metabolize alcohol more slowly.
Thus, women reach higher BAC levels than men.
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