Fact 1: Digestion is the process of breaking down food into components the body can absorb.

Fact 2: Lack of salvia hinders digestion.

Given the two facts above, answer the question "Lack of which of the following can hinder the break down of food in the body?" with the following options: 
- acid rain
 - water
 - salt
 - Weight
 - chemicals
 - recycling
 - sun
 - saliva


 

        saliva 