I believe the answer is B. I say Natural gas because the materials used for the natural gas can run out. Renewable energy sources are sources of energy that are continuous and do not run out. Biomass is gotten from waste of living things, as long as there are living things, it lasts. The wind keeps coming, so it provides more energy. Geothermal energy is the energy generated and stored in the earth. There will always be heat on earth. Hope i helped. Have a nice day. Happy new year.
Answer:
Birds require high levels of oxygen and, therefore, high rates of gas exchange due to flight demands. Avian resting oxygen consumption is high compared to that of mammals and other vertebrates, and this increases even more during the flight.
Explanation:
Compared to mammals, birds have specific adaptations of the respiratory system that result in higher levels of oxygen exchange.
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An increase in genetic variation
Answer:
Mutations on DNA that can lead to skin cancer and other skin problems
Explanation:
A Pyrimidine dimer is a molecular lesion that causes mutations that can lead to melanomas and skin sensitivity. It is caused by a photochemical reaction after the exposition of DNA to ultraviolet light.
These mutations happen on thymines or cytosines and can be repaired by a photolyase, an enzyme that adhere the dimers.
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