Answer:
Carbon is the primary component of macromolecules, including proteins, lipids, nucleic acids, and carbohydrates. Carbon's molecular structure allows it to bond in many different ways and with many different elements.
Explanation:
Molecules that have partially charged positive and negative areas are polar. Because water molecules are polar, water can dissolve many other polar substances. Water can also dissolve ionic compounds such as table salt.
It prevents micro bacteria from entering our body, so it would be A.) Preventing infection
I believe the answer is the third option: Nervous.
