Question

How do lungs get rid of all the co2 they’ve picked up from the blood? And why do you think the body’s cells need oxygen

Answer 1

Carbon dioxide (CO2) is a waste product of cellular metabolism. You get rid of it when you breathe out (exhale). This gas is transported in the opposite direction to oxygen: It passes from the bloodstream – across the lining of the air sacs – into the lungs and out into the open.

Answer 2

Your lungs get rid of co2 when you breathe out (exhale). the oxygen you breathe to get energy from the food you eat.
hopefully this kinda helps!