You are presented with the quiz "What increases the rate of all the chemical processes in living organism cells?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "thyroid hormones increase the rate of metabolism in cells throughout the body" and "metabolism is the sum of all the chemical processes in a living organism". 

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


 

 Thyroid hormones          