What makes up tissue? A) a group of cells
B) a group of muscles
C) a group of organs
D) a group of organ systems

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.

on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.