Ken, age 14, has trouble concentrating, sleeps excessively, eats little, and has low
energy. These might be symptoms of
A) an identity crisis.
B) depression.
C) a vitamin C deficiency.
D) the normal storm and stress of puberty.
After age 8, girls __________ than boys.
A) are slightly shorter and lighter
B) have slightly more muscle
C) have slightly less body fat
D) begin accumulating fat at a faster rate
Researchers have found that satisfying sex generally involves
A) good physical technique.
B) an emotionally fulfilling relationship.
C) spontaneity and novelty.
D) experience with multiple partners.