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

Fact 2: Mammals have a diaphragm to aid in respiration.

Given the two facts above, answer the question "what does a diaphragm aid in?" with the following options: 
- sweating
 - movement
 - excretion
 - Plants growth
 - magnetisation
 - animal transport
 - digestion
 - respiration


 

        respiration 