Fact 1: Mammals breathe with the help of a diaphragm.

Fact 2: When a person stops breathing, they die.

Given the two facts above, answer the question "What do mammals use a diaphragm for?" with the following options: 
- movement
 - Movement of an air mass
 - Pumping water
 - survival
 - Preventing death
 - To keep their body heat.
 - Shaving cats
 - Making friends


 

     Preventing death    