Why dont two species occupy the exact same ecologial niche?

Only one will survive

Explanation:

Ape

b.have there own function.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.