False labor contractions can usually be recognized because they are more regular than contractions of real labor

Research suggesting that cigarette smoking by teenagers increases the risk for developing anxiety disorders as adults indicates that

a. the negative effects of smoking are permanent. b. environmental factors can affect susceptibility to the development of anxiety disorders. c. adolescents have underdeveloped brain circuits. d. nicotine decreases anxiety levels.

Wayland is studious and works very hard on his course work. Based on research, it is likely that his friends

a. also work hard at school. b. spend little time studying. c. think he works too hard. d. come to him for help.