Answer: Septum: Prevents oxygen rich blood mixing with oxygen poor blood in the heart.
Valves: Prevent backflow.
Explanation:
D. an animal that resides in the twilight zone
Answer:
c
Explanation:
I think because it's not doing any chemical reaction
Answer:
energy is provided by the sun
Answer:
<u>The ocean absorbs nitrogen gas from the atmosphere. In open-ocean areas with low concentrations of nutrients (“oligotrophic” regions), some of this nitrogen is taken up by microbes and transformed into various chemical compounds</u>
