Mammals breathe with the help of a diaphragm, and breathing Stomach muscles press against the resistance of the diaphragm. Given these facts, what is pressed against when mammals breathe among the following options:
- objects that have mass
 - the skin
 - an organism's body
 - an object
 - layers of fat
 - matter vibrating
 - a cuticle
 - stomach muscles


 

        stomach muscles 