People with kidney failure are unable to remove wastes (metabolites) from their blood. A Dialysis machine can perform this function using difusion and osmosis to clear the blood of wastes. Explain how the processes of diffusion and osmosis can work in a Dialysis machine to cleanse the blood of waste products

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.

i think the answer is a.keratin is the pigment responsible for skin color.