B. The flower color in a population changes over time.
The contractile vacuole expels water out of the cell by contrasting.
Huh? What is the question
Answer:
Increase the reaction rate
Explanation:
Enzymes are organic substances that are produced to catalyse and speed up chemical reactions in chemical reactions. Enzymes take part in product formation. They lower the activation energy by acting as catalysts during a chemical reaction thus products are formed faster.