You are presented with the quiz "What can thorough cooking do to food?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "killing microorganisms in food can be used to extend the shelf life of that food" and "thorough cooking is the most effective way to kill microorganisms in food". 

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


 

  extend the shelf life         