Question

how does an enzyme speed up (catalyze) a chemical reaction? by lowering the activation energy by stopping all chemical reactions in the body

Explanation:

Enzymes act as biological catalysts. The key mechanism by which they speed up chemical reactions is by lowering the activation energy (the energy barrier that reactants must overcome to undergo a reaction). The option "by stopping all chemical reactions in the body" is incorrect as enzymes facilitate, not stop, reactions.

Answer:

by lowering the activation energy