Which disease might be prevented by not sharing a water bottle?

What is an important step to prove something is valid or not? determining the reliability observing research testing

Which of these is a sexual stereotype? a) on average, males are taller than females. b) people over the age of 60 are not interested in sex. c) male hormone levels differ from those of females. d) there are more male representatives than female representatives in congress.

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