You are presented with the quiz "All what relies on a narrow range where biochemical reactions can be catalyze by enzymes" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says 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". 

So, what's the best answer to the question?


 

       life    