Question

by lowering the activation energy
active site
how do enzymes speed up chemical reactions?
factors that affect enzyme activity
denature

Explanation:

The question "How do enzymes speed up chemical reactions?" is related to the function of enzymes in biochemical reactions. Enzymes act as biological catalysts, and their primary mechanism for speeding up reactions is by lowering the activation energy required for the reaction to occur. This is a key concept in Biology (a subfield of Natural Science) as it pertains to the study of biological molecules and their roles in cellular processes.

Answer:

By lowering the activation energy.