Menarche does not usually occur until a girl weighs 100 pounds (45–48 kg)

You are trying to convince a friend to go out for a night on the town, but she refuses, saying "I just have so much to get done and I don't want to leave it until the last minute."

You try to convince her to stop being so responsible and to have some fun, but she refuses. Finally, in a fit of frustration, you yell "Why are you so anal all of the time?" Your friend, a psychology major, laughs at you and says "Gee, I didn't know that you believed in the psychological theories of __________." a. B.F. Skinner b. Charles Darwin c. Abraham Maslow d. Sigmund Freud

Approximately what percent of American adolescents below the age of 19 live with only their biological mothers?

A) 5 B) 15 C) 20 D) 30