According to the fossil record found across this area of the coastal united states, what conclusion can we make about area a? a) vertebrates never lived in area a b) area a was completely under water in the past c) life forms appeared in area a before areas b and c d) area a was once land mass that eventually became submerged

It’s B. Area A was completely under water in the past.

Ifound this on google “here are some features of the alveoli that allow this: they give the lungs a really big surface area. they have moist, thin walls (just one cell thick) they have a lot of tiny blood vessels called capillaries.for more information go to the website below › bitesize › guidesi hope this you for what your looking for. can you plz mark me brainliest?