I think it is rna, or ribosomes
Compositional layers are determined by their components, while mechanical layers are determined by their physical properties.
Answer:
B
Explanation:
I would say this because the pulmonary circulation only transports deoxygenated blood. And this blood gets transported to the lungs so the lungs can absorb oxygen and release carbon dioxide. I am not sure about this one though. This is what I think.
<span>Pure water has a pH of 7. Pure water is neutral.</span>
B water pollution is the answer
