What is the variety of all living things within an area?

How does buring fossil fuels impact does carbon cycle? what large impact does this have on the envirnment?

Biomass can be used to generate electricity. biomass relies heavily on agricultural crops. plants release carbon dioxide and water in combustion. plants use photosynthesis to originally generate the energy that is needed. the chemical energy of these plants all started with what energy source?

If a strand of dna has 35% thymine. what is the percentage of cytosine, adenine, guanine?