You are presented with the question "All what relies on a narrow range where biochemical reactions can be catalyze by enzymes" and the following answer choices: 
- sugar
 - weathering
 - Crops
 - CO 2
 - climate
 - heat
 - life
 - weather

Now knowing that all life relies on a relatively narrow range of pH, or acidity and biochemical reactions are catalyzed by enzymes that have very narrow ranges of optimum pH values, choose the best answer.


 

       life  