4. What is atherosclerosis? How do plaques form, and why
are
they dangerous?

Plagues form by a mutation of a disease which can mutate to become more deadly such as coronavirus which is also like the plague

Explanation:

Atherosclerosis is a disease in which plaque builds up inside your arteries. Plaque forms when cholesterol lodges in the wall of the artery they are dangerous because the plaque is so sticky that it keeps the acids in contact with your teeth, in time breaking down the enamel and leading to tooth decay.

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what effect does exercise have on the nervous system?

the answer is c.