You are presented with the question "Lack of which of the following can hinder the break down of food in the body?" and the following answer choices: 
- acid rain
 - water
 - salt
 - Weight
 - chemicals
 - recycling
 - sun
 - saliva

Now knowing that digestion is the process of breaking down food into components the body can absorb and lack of salvia hinders digestion, choose the best answer.


 

        saliva 