Does an asteroid need to hit the earth to do damage? why or why not?

No.

This is because asteroids can do damage to the ozone layer.

i think the answer is b.

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.