Pls help me who is good at science!! answer #3

biology is the study of life. it is the study of living organism.

cell regulation is conducted by special proteins.

easy

explanation:

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.