Widespread immunization eradicated ______, the most lethal disease of all for children

One change in mental activity that occurs during early adolescence is that young people are able to

a. consciously experience changes in the brain. b. generate perceptions based on fantasy principles. c. generate hypotheses about events they have never perceived. d. use motor behavior as the basis of planning activity.

Jet lag is primarily a result of ____.?

a. ?sleep deprivation b. ?being in an airplane for a long period of time c. ?disrupted circadian rhythms d. ?culture shock