neurons are cells of the nervous system as part of the normal function a neuron pumps ions out of the cell and potasssium ions into the cell

i would have a lunch. it's one big package of food, making it one food. : p

idk why hjggjhjkhj

correct answer is a. and d.

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.