The ten guidelines in the Dietary Guidelines for Americans are categorized into how many groups? A. five
B. three
C. four
D. two

what effect does exercise have on the nervous system?

the answer is c.

this is really easy just look up what these words mean

well, it depends. it is natural to not fall asleep before 11: 00 p.m. teens need about 8-10 hours of sleep each night to function best.

enjoy your day!

answer normal force;