Mary Carskadon and her colleagues’ research on adolescent sleep patterns found that:
A.when given the opportunity, adolescents will sleep an average of 9 hours and 25
minutes a night.
B.adolescents’ biological clocks undergo a shift as they get older, so that older
adolescents start to feel sleepy an hour earlier than younger adolescents.
C.younger adolescents tend to be sleepier during the day than older adolescents.
D.increased sleepiness in adolescents during the day was primarily due to academic
work or social pressures.
Answer:
Which of the following statements about bone density is TRUE?
A.Maximum bone density occurs in late adolescence.
B.Maximum bone density occurs by the mid- to late thirties.
C.Peak functioning of the body’s joints occurs in the fifties.
D.The rate of bone density loss accelerates and then decelerates.
Answer: