I think the answer IS B or D
Answer:
Myelin is an insulating layer, or sheath that forms around nerves, including those in the brain and spinal cord. It is made up of protein and fatty substances. This myelin sheath allows electrical impulses to transmit quickly and efficiently along the nerve cells.
Answer:
Coupling
Explanation:
two or more things doing something the same
<span>The answer would be
B.He probably feels that cities are too crowded.</span>
