You are presented with the quiz "Lack of which of the following can hinder the break down of food in the body?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "digestion is the process of breaking down food into components the body can absorb" and "lack of salvia hinders digestion". 

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


 

        saliva   