Question

choose the correct answer. 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 are biological catalysts. They speed up chemical reactions by providing an alternative reaction pathway with a lower activation energy, as shown in the energy - reaction progress graph where the activation energy ($E_a$) is lower when the enzyme (catalyst) is present. Stopping all chemical reactions in the body is not how enzymes work.

Answer:

by lowering the activation energy