A is the central nervous system and i think b is the peripheral nervous system
Im not sure, but im guessing a, c, and b but this is probably wrong
A. Depressants because Depressants are drugs that are capable of interfering with the normal functioning of the central nervous system, leading to decreased brain activity. In people who consume depressants symptoms such as: Drowsiness, Lack of attention, Confusion, Dizziness, Slowness to process information, Decreased mobility, etc. Other effects caused by the consumption and abuse of these substances are: Fatigue, Depression, Sleep disorders, Sexual dysfunction, and even memory disorders.
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Answer:
An activity that you shouldn't spend a lot of time on is probably watching tv or playing on your phone, but that doesn't really stop me :).