The amounts of mood-elevating chemicals in the brain are a. lower in sedentary people than in those who are physically active. b. the same in sedentary people and in those who are physically active. c. higher in sedentary people than in those who are physically active. d. present in sedentary people but nonexistent in those who are physically active.

Which statement is true about common childhood infectious disease? a. children should always be given antibiotics to treat an infectious illness. b. frequency of infectious illnesses usually increases as children grow older. c. having a minor infectious illness weakens a child's immune system. d. infectious illnesses are usually mild and require no medication.

What system have glands found throughout the body that release hormones into the bloodstream

Which action is most likely to contribute to a positive self-image?