Answer:
B.
Explanation:
The answer is B cause if there so old the have to be in the bottom not the top. Plus the new rocks are far so the old rocks or close.
Is the Harvard Forest a carbon source or a carbon sink, and how has the net ecosystem exchange (NEE) changed over time?
Answer:
This is strong evidence that suggests that the forest acts as a carbon “sink”: each year, it removes more CO2 from the air than it produces.
Explanation:
There are different sources of carbon. Harvard Forest is known to be a carbon sink.
Harvard Forest is known to have active C sink that is due to the forest regrowth after land abandonment.
Net ecosystem exchange is known to be negative every year. but the result is shown to be very variable. Result also show a decrease over time and this implies that the forest is removing more CO2 from the atmosphere presently than before.
When you look at the data of the last 25 years, there is a pattern of NEE being negative and also many variability.
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A male from species A mates with a female from species B. Male A’s sperm swims and finds the egg, but the sperm is unable to penetrate the egg. This is an example of
Answer: Gametic isolation
Explanation:
Sperm of one species may not be able to fertilize the eggs of another species. For instance, sperm may not be able to survive in the reproductive tract of females of the other species, or biochemical mechanisms may prevent the sperm from penetrating the membrane surrounding the other species' eggs
The atrioventricular (AV) node spreads the electrical impulse to both ventricles through which of the following?
Answer:
All of the above is correct
Explanation: and .... my name!
100 POINTS
This image from the EPA shows the projected benefits and costs from the most recent amendments to the Clean Air Act. A net improvement in economic welfare is projected because cleaner air leads to better health and productivity for American workers. It also reduces medical expenses for air pollution-related health problems.
alternative pie chart showing comparison of benefits and costs of Clean Air Act Amendment programs
Based on your findings in parts A to C, write a summary paragraph evaluating the Clean Air Act in terms of cost and effectiveness. Cite evidence for your reasoning.
Answer:
One of the health hazards that suprised me is that outdoor pollution is associated with hearth attacks. I know that outdoor pollution causes lung problems whether that's asthma attacks or bronchitis, but I didn't know about heart attacks. Apparently, air pollution can trigger heart attacks, stroke, and irregular heart rhythms. People who are already at risk for these conditions are more likely to have any of those. Air pollution causes damage to the inside walls of your blood vessels, causing them to become narrower and harder. Along with that, there are many different positives and negatives that came from the Clean Air Act some of which are:
Positive Outcome :
Cleaner lungs.
Decreased asthma and allergies symptoms.
Improved skin appearance.
Helps digestion.
Psychological and emotional stabilizer.
Better mood and normalized sleep patterns.
Reduce chances of lung, heart, and arterial diseases.
Negative Outcome :
According to the EPA, when we are exposed to high levels of hazardous air pollutants for an extended period of time .
We face a greater risk of suffering serious health effects, including respiratory diseases, neurological disorders, reduced fertility, damage to our immune system, and increased risks of getting cancer.
I believe that it was effective and there was definitely a purpose to this Act because even though our air pollution is getting worse each day, I'm sure that it isn't as bad as it could be if the Act wasn't put in place.
which of the 3 types of blood vessels carries blood to the body, away from the heart?
Answer:
The arteries carry blood away from the heart.
A fellow student asks, "How is
it possible that six feet of DNA
can fit inside a single,microscopic nucleus of a cell?" If you
were to unravel a ball of yarn,
it would probably be able to circle
around your house (that's a
long distance!). Use this
comparison to answer
your fellow student's question.
Answer:
DNA is wrapped around proteins known as histones to form chromatin. Packing the DNA into nucleosomes condenses the DNA approximately sevenfold. It can be further organized by winding the chromatin into more compact structures. Coiling the chromatin around itself decreases the space it occupies by another sixfold or so. Through a series of similar compacting strategies, the entire genome can fit inside the nucleus of a single cell.
Explanation:
What is the main difference between photosynthesis and cellular respiration?
A. Photosynthesis releases energy and cellular respiration stores energy.
B. Only plants can use photosynthesis and only animals can use cellular respiration.
C. Cellular respiration releases energy and photosynthesis stores energy.
D. Cellular respiration releases oxygen and photosynthesis releases carbon dioxide.
Answer:
D. Cellular respiration releases oxygen and photosynthesis releases carbon dioxide
1.) Define Pure substances:
2.) What are the two different types of Mixtures?
3.) What are solvent and solute? Give an example for both.
Explanation:
The substances that are free from any kind of mixture and contain only one kind of particle are pure substances.There are two types of mixtures: heterogeneous and homogeneous.Solvent is, in simplest terms, something in which you dissolve another substance (also called as solute) and this mixture will yield what we know as a 'solution'. ... Some examples of solvents are water, ethanol, toluene, chloroform, acetone, milk, etc. Examples of solutes include, sugar, salt, oxygenWhy is DNA called the universal genetic code?
A.) All DNA is contained in the nucleus of a cell.
B.) DNA has been found on every planet in our universe.
C.) All organisms are made up of DNA which is made up of nucleotides.
D.) DNA is found in animal and plant cells, but not in bacteria.
Answer: C
Explanation: flvs exam
DNA is called the universal genetic code because, all organisms are made up of DNA which is made up of nucleotides. The nucleotides present in all organism is of the same types but they differ in the arrangements.
What is DNA ?Deoxyribonucleic acid or DNA is the basic unit of the genetic material in every level of living organism. DNA is the hereditary material that is inherited from the parent cells to the daughters cells during reproduction.
A DNA molecule is made of a ribose sugar a phosphate group and a nucleoside. Two such strands are joined together to form a DNA sequence where, the two strands are connected through the nitrogen bases adenine, guanine, cytosine and thymine as a the steps in a stair case.
The helical structure of DNA is same for all kind of organisms however, the arrangement of nitrogen bases differ. Animals, plants, fungi, bacteria, virus, and all other prokaryotes even contain DNA in their cells. Hence it is called the universal genetic code.
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what is the main relationship between the trachea bronchioles and alveoli
Answer:
they distribute air to the lungs
The difference between organisms are
A. Mutation
B. Variation
C. Natural Selection
Answer:
B. Variation
Explanation:
Thanks...........
what molecules do cells need to release energy? pls help lol
Answer:
Claim 3...... Oxygen........
do identical twins have the same fingerprints
Answer:
no
Explanation:
Identical twins do not have identical fingerprints, even though their identical genes give them very similar patterns. ... Small differences in the womb environment conspire to give each twin different, but similar, fingerprints. In fact, each finger has a slightly different pattern, even for your own fingers.
Because plants don’t have interior or skeletons , they rely on their cells all’s to give them structural support, how does it different form animal cells
The greatest cause of the worldwide loss of species is ________. habitat destruction climate change air pollution water pollution decreased soil nutrients
Answer:
The greatest cause of the worldwide loss of species is climate change.
a greasy and dirty pot results after cooking. this will be cleaned by dishwashing detergent. how does the soap work?
A detergent works by solubulizing grease and forming an emulsion of the grease with water.
A detergent is commonly used as a cleaning agent. Every detergent consists of a hydrophobic tail and a hydrophilic head. The hydrophilic head is capable of interaction with water hence the detergent can dissolve in water. Its hydrophobic tail is capable of interaction with grease.
A detergent works by agglomerating its molecules into micelles which dissolve the grease. Mechanic scrubbing completely eliminates the grease creating an emulsion with water.
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what invention allowed scientists to study cells for the first time?
what color is the sky...
Answer:
A cloudless sky in the daytime, appears blue to the human eye.
but that is only bc of the water so really we never know
Explanation:
Answer:
the sky is purple and yellow is good
Which part of the brain has the most motor connections and is the location for the upper motor neurons
Answer:
cerebral cortex
Explanation:
Upper motor neurons are located in your brain and spinal cord. They send signals to lower motor neurons.
The upper motor neurons originate in the cerebral cortex and travel down to the brain stem or spinal cord, while the lower motor neurons begin in the spinal cord and go on to innervate muscles and glands throughout the body.
Which of the following ocean-floor features is associated with trenches?
Answer:
so you know how much is it
I store food, water, and waste by products in the cell; Who am I?
A. Nucleolus
B. Mitochrondria
C. Ribosomes
D. Vacuoles
3. In general, metals are ____.
a
poor conductors of heat
b
brittle
c
poor conductors of electricity
d
good conductors of heat
Answer:
D
Explanation:
Answer:
good conductors of heat
Explanation:
How did building a model of the stages of cell division help you? Be sure to explain.
Answer:
I don't know oo the answer hard sha
Help meee
Which of these changes is a possible negative consequence of farmers allowing livestock to overgraze a pasture?
A. Shortage of freshwater
B. Deforestation
C. Desertification
D. Abundance of clean air
Answer:
B. Deforestation
Match each vein with the correct label. (leg)
Answer:
1. Common Iliac
2. Femoral
3. Popliteal
4. Small Saphenous
Explanation: is correct
Research suggests that a permissive parenting style usually has the best outcome for children.
True
False
False
Explanation:
Becuase this may make the children very bad and unpolite in the future.
why do animal cells have more mitochondria than plant cells
Answer:
I believe it's due to the movement and use of energy.
Explanation:
Plants tend to move much less than any animal, even if that animal didn't do very much. Plants don't chase and hunt down prey, but leopards do. Therefore, more mitochondria will benefit the animal who moves, versus the plant that does not.
Mitochondria are energy producers, which plants don't necessarily need more of.
Sketch and label a general life cycle diagram of a
gymnosperm. Your diagram must include the following: female cone, male cone, pollen grains, scale, seeds, eggs, adult sporophyte, pollination, germination, fertilization.
Answer:
?
Explanation:
Characteristics of Gymnosperms
Gymnosperms are seed plants adapted to life on land; thus, they are autotrophic, photosynthetic organisms that tend to conserve water. They have a vascular system (used for the transportation of water and nutrients) that includes roots, xylem, and phloem. The name gymnosperm means “naked seed,” which is the major distinguishing factor between gymnosperms and angiosperms, the two distinct subgroups of seed plants. This term comes from the fact that the ovules and seeds of gymnosperms develop on the scales of cones rather than in enclosed chambers called ovaries.
Gymnosperms are older than angiosperms on the evolutionary scale. They are found far earlier in the fossil record than angiosperms. As will be discussed in subsequent sections, the various environmental adaptations gymnosperms have represent a step on the path to the most successful (diversity-wise) clade (monophyletic branch).
Gymnosperm Reproduction and Seeds
Gymnosperms are sporophytes (a plant with two copies of its genetic material, capable of producing spores ). Their sporangia (receptacle in which sexual spores are formed) are found on sporophylls, plated scale-like structures that together make up cones. The female gametophyte develops from the haploid (meaning one set of genetic material) spores that are contained within the sporangia. Like all seed plants, gymnosperms are heterosporous: both sexes of gametophytes develop from different types of spores produced by separate cones. One type of cone is the small pollen cone, which produces microspores that subsequently develop into pollen grains. The other type of cones, the larger “ovulate” cones, make megaspores that develop into female gametophytes called ovules. Incredibly, this whole sexual process can take three years: from the production of the two sexes of gametophytes, to bringing the gametophytes together in the process of pollination, and finally to forming mature seeds from fertilized ovules. After this process is completed, the individual sporophylls separate (the cone breaks apart) and float in the wind to a habitable place. This is concluded with germination and the formation of a seedling. Conifers have sperm that do not have flagella, but instead are conveyed to the egg via a pollen tube. It is important to note that the seeds of gymnosperms are not enclosed in their final state upon the cone.
Answer:
Gymnosperms produce both male and female cones, each making the gametes needed for fertilization; this makes them heterosporous.
Megaspores made in cones develop into the female gametophytes inside the ovules of gymnosperms, while pollen grains develop from cones that produce microspores.
Conifer sperm do not have flagella but rather move by way of a pollen tube once in contact with the ovule.
How does thermohaline circulation force the thermocline toward the
ocean's surface?
Thermohaline circulation begins in the Earth's polar regions. When ocean water in these areas gets very cold, sea ice forms.
What is Thermohaline circulation?The thermohaline circulation (THC) is that part of the ocean circulation which is driven by fluxes of heat and freshwater across the sea surface and subsequent interior mixing of heat and salt.
What is polar region?The areas of the Earth that encircle its geographical poles and are contained inside the polar circles are known as the polar regions, sometimes known as the frigid zones as well as polar regions.
These deep-ocean currents are driven by differences in the water's density, which is controlled by temperature (thermo) and salinity. This process is known as thermohaline circulation. In the Earth's polar regions ocean water gets very cold, forming sea ice.Thermohaline circulation begins in the Earth's polar regions. When ocean water in these areas gets very cold, sea ice forms. The surrounding seawater gets saltier, increases in density and sinks. Winds drive ocean currents in the upper 100 meters of the ocean's surface.
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Look at the table for energy used in activities. James goes walking for 1.5 hours a week and running for 0.5 hours. James has a mass of 65kg. How much extra energy will he need a week in order to go running and walking?
The extra energy needed by James in a week is 1950 joules.
Dimensionally speaking, the energy ([tex]E[/tex]) , in joules, need by a person while doing an activity is defined by the following expression:
[tex]E = m\cdot t\cdot c[/tex] (1)
Where:
[tex]m[/tex] - Mass, in kilograms.[tex]t[/tex] - Time, in hours.[tex]c[/tex] - Energy index, in joules per kilogram-hour.The extra energy needed by James is the sum of the energy spent both by running and walking:
[tex]E = 65\,kg \times \left(1.5\,h \times 10\,\frac{J}{kg\cdot h} + 0.5\,h \times 30\,\frac{J}{kg\cdot h} \right)[/tex]
[tex]E = 1950\,J[/tex]
The extra energy needed by James in a week is 1950 joules.
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