Explain why it is important to remain drug-free during the teenage years.

Responses will vary. A sample response follows: Teens should not take drugs because they face lifetime risks. These risks include being more susceptible to the drug's effects. A teen's brain is still developing, and teens have a greater risk for addiction. Taking drugs can cause irreversible effects on the brain and could lead to lifelong struggles, including ways to cope with problems or issues in a healthy manner.

Explanation:

100% correct on edge

what effect does exercise have on the nervous system?

the answer is c.