Answer:
Organisms form carbon film when sediments cover the organisms and decay of organisms form hollows.
Explanation:
A stands out most to me, CO comes from the air and air is basically oxygen we breath. When we exhale CO comes out (of course). I would say A is correct.
Answer:
Organelle (oppitional, I don't put this on my paper but you can if you want), cells, tissues,
Explanation:
A concentration gradient and membrane that allows water to pass, but not the solute, must be present
