Which type of molecule speeds up chemical reactions in living things? lipid nucleic acid protein water

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?

The normal shape of an enzyme is as shown in structure a. if the enzyme’s shape changes to that shown in structure b, what are two consequences of this change?