Significantly in 50 years. 1. The average life expectancy for all Americans has

A decreased
B increased
C stayed the same

Because without physical activity, the body has extra "energy" if you will, and so when it is time for bed you are not tired, so you end up staying up all night. also there is probably an effect on your internal clock, which messes with your melatonin production which goes hand in hand with your sleep cycle

Small intestine because that is the organ which absorbs nutrients

Lifting and pull ups

Iwould have to go with the last one "have personal value and positive expectations."    hope it : 3 if im wrong tell me