Answer:
The four main classes of organic compounds (carbohydrates, lipids, proteins, and nucleic acids) that are essential to the proper functioning of all living things are known as polymers or macromolecules. All of these compounds are built primarily of carbon, hydrogen, and oxygen but in different ratios.
Explanation:
Option B, "They need more oxygen to function, so gas exchange needs to increase. "
I believe the answer is b sorry if I’m wrong
Answer:
No, I haven't learn that when I learn it I will teach you everything I know
