Which age most closely resembles a teenager's total life expectancy in the united states?

by looking at someone you know and chat with them or look on something like a painting or anything then the person or bring a book with you and act like you reading something or think about something that you like so you can spaceout and not put attention to what is happening around you .

what effect does exercise have on the nervous system?

the answer is c.

true child development specifically