Name one pair of rays that are opposite
not rays

Rays having same endpoint E but not in the opposite directions are ED and EC. This pair of rays meet at point E having different directions.

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.