The answer for your question is b and c.
Hope this helps:)
The myelin sheath (C) insulates the axons.
The myelin sheath is a fatty substance, hence why it is great for insulation. <span />
Answer:
So you dont spread the germs along with wearing masks this helps a lot.
Explanation:
That answer would be A. nucleus
Basically they just take it into the cell by engulfing it. Once it is inside the cell it is broken down!