What fraction of high schoolers do not participate in vigorous activity?
О1/3
О 1/4
O 1/2
O 1/8

How could you find out if that advice is based in scientific evidence?

If you are having a hard time lifting something, you should arch your back. a. true b. false

Bennett has trouble interacting with other students in school lately. he has become frustrated easily when asked to work in groups, and he has been withdrawing from class discussions. his teacher is worried about his