Well it could be A but I think D is better. While A is true D is more specific to how humans are disrupting the cycle.
Answer:
plants take in oxygen and release carbondioxide during respiration
Explanation:
<span>In an enzyme controlled reaction, a substrate is the same as a reactant.
Reactant is a substance that will be used (there will be reduced) in reaction. Substrate will bind with enzyme and undergo a chemical reaction, so it will be used to make the product. Catalyst is helping reaction but not used, thus it's not a reactant. </span>
Answer:
The answer is if the niches of two organisms were moved to the other ecosystem they would compete with one another for the same food and other resources in the environment. Eventually, one species would be likely to outcompete and replace the other.