Organism that lives in or on another organism often with harmful side effects but without benefits is what?

the aorta is the large artery leaving the heart branches into smaller arteries, which eventually branch into capillaries.the arteries carry oxygen and nutrients away from your heart, to your body's tissues. the capillaries are small, thin blood vessels that connect the arteries and the veins. the statement that arteries carry oxygen-rich blood to capillaries is true. veins on the other hand are blood vessels that take oxygen-poor blood back to the heart.

the answer is

the answer is c dandruff

answer(b) keep oxygenated and deoxygenated blood separate;