Answer:
C3H8O= C3 + H8 + O
Explanation:
You do not need to write the one for oxygen, yo can if desired
A true a substance that can be decomposed by bacterial
I'm not sure what you mean by "compartments", but the cardiovascular system consists of the heart, blood vessels, and approximately 5 liters of blood.
I believe it is A. Primary succession starts with plants and rocks.