Molecules of o2 pass through the walls of the alveoli and enter the bloodstream through the

i beleive that is the respiratory system but ill double check in  a m inute

alright heres all your answers for that test question 1 true

question 2 oxygen question 3 carbon dioxide question 4 true question 5 alvoei question 6 diaphram question 7 respitory system  the last 3 are all true i hope i helped

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

bru what tyep of qus is dis