Which statement best describes how enzymes function in the body?

a. enzymes lower the activation energy of reactions
b. enzymes are converted into products by the reactions they catalyze
c. one enzyme can catalyze many different reactions
d. an enzyme is used one and then destroyed by the cell

A. Enzymes lower the activation energy of reactions

Explanation:

Enzymes are biochemical catalyst produced in the body that alter the rate of digestion of food substance.

Like other chemical catalyst, enzymes reduce the activation energy (which is the energy the reactants must attain before being converted to products) in a chemical reaction.

As such, Enzymes lower the activation energy of reactions

the answer is:

carbon dioxide