Question

multiple - choice question
how do enzymes speed up reactions?
by raising the temperature
by breaking down other enzymes
by lowering the activation energy

Explanation:

Enzymes are biological catalysts. They speed up chemical reactions by providing an alternative reaction pathway with a lower activation energy, which is the energy needed to start a reaction. Raising temperature can increase reaction rate but it's not how enzymes work. Breaking down other enzymes has no relation to speeding up reactions.

Answer:

C. by lowering the activation energy