Answer:
Energy flows through an ecosystem in only one direction. Energy is passed from organisms at one trophic level or energy level to organisms in the next trophic level. ... Organisms need it for growth, locomotion, heating themselves, and reproduction.
Explanation:
Answer: (B) Paracrine signaling
Explanation: Paracrine signaling occurs between cells that are relatively within a short distance apart. The signaling triggers quick responses and can last only for a short period of time because of the wearing-off of the paracrine ligands (neurotransmitters).
Cells that exhibit paracrine factors release them into the immediate extracellular environment.
<span>The answer is A. it was the first clean water act in U.S. history.
It was the first clean water act federal law created to solve water pollution through restoration and management. It gave a rule to pollutants to keep the waters clean.
</span>
<span>The purpose is to regulate cell division. Preventing it from occuring when it is not needed, and inducing it when it is.
</span>