water and oxygen can move across the membrane of the alveoli in the lungs. how would their paths through the alveoli cell membrane differ

well, you see. the answer to your question is quite simple. the thing that is big, powerful, and over 9,000 is your mom.

"a.) well–developed vascular system."

b. lithosphere, asthenosphere, mesosphere   is the answer most likely

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.