What is the answer to what a muscle located behind your lungs called?

I am pretty sure its the diaphragm, but its not located behind the lungs its below the lungs. 

It is evolution, because we all have some of the same traits like eye color or shape or ears.

I’m not exactly sure what your trying to ask, but if it’s how an organelle is similar to a body system or a part a nucleus is like a in function. but i don’t fully understand what you’re trying to ask