You are presented with the quiz "What is when a cell converts from oxygen and carbohydrates into carbon dioxide, water, and energy?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "cellular respiration is when a cell converts from oxygen and carbohydrates into carbon dioxide, water, and energy" and "cellular respiration is a requirement for life". 

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


 

  requirement for life         