How does the optimal ph relate to
the environment each enzyme works in?

pH: Each enzyme has an optimum pH range. Changing the pH outside of this range will slow enzyme activity. Extreme pH values can cause enzymes to denature. Enzyme concentration: Increasing enzyme concentration will speed up the reaction, as long as there is substrate available to bind to.

Explanation:

✿   this landform has a high elevation and a high relief

✿   this landform is a mountain

the correct answer is d