someone please please help me with this I would really appreciate it with a explanation ! (No links )

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.

sorry, is there a picture? i do not see any arrows.

wut? unius0123 wut?

i would think a oil tanker that has leaked in a bay

answer; endoplasmic reticulum;