How does exercise improve physical health? a)the bones are thickened. b)the heart beats faster at rest. c)the liver gets larger. d)good muscle tone is created. e)muscle fibers get bigger. f)more bones are produced. g)the body organs work better.

What is the most common blood type in the u. s.?

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.

Which is the term used for a drug that increases the activity of the nervous system