Answer:
C
Explanation:
Plants and Animals breathe in carbon and convert the carbon molecules into oxygen!
I would say keep the soil from eroding and doesn't let it get dried out so fast.
Answer:
D
Explanation:
it has to be D because its talking about "how does a volcanic ash affect water systems"
Explanation:
What happens during daytime is, oxygen that gets trapped between filaments of algae, moves them to the surface and during night as O2 is not produced, they slowly sink to lower depths, and you don't see them
