Why do living things use enzymes instead of heat as a source of activation energy? adding heat would not give the reactants enough energy. adding heat does not affect how chemical reactions take place. adding sufficient heat would harm or kill a living thing. adding heat gives reactants the wrong kind of energy.

Adding sufficient heat would harm or kill a living thing.

Living things use enzymes instead of a heat source because they speed up chemical reactions as well as the metabolism in those living. Adding sufficient heat would harm or kill a living thing, also enzymes are far more efficient. A single enzyme can often carry out thousands of reactions per second. Living organisms use enzymes for activation energy because they speed up chemical reactions.

I’m not sure what your trying to say here.. can you clarify again?