What is job of sperm cells?

The function of a sperm is to pass on the necessary biological information required to produce a new organism

i think the miocene epoch spans the time from 23 million to 12 million years ago.

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.