You are presented with the question "what does a diaphragm aid in?" and the following answer choices: 
- sweating
 - movement
 - excretion
 - Plants growth
 - magnetisation
 - animal transport
 - digestion
 - respiration

Now knowing that mammals breathe with the help of a diaphragm and mammals have a diaphragm to aid in respiration, choose the best answer.


 

        respiration 