According to one recent study, since 2000, the trend of intercourse during adolescence has:

Which of the following pairs of siblings is most likely to have the closest, warmest relationship?

a. Yarone is 13 years old, and his younger sister Shayla is 8 years old b. Tiffany is 5 years old and her younger brother Tajuan is 4 years old. c. Marquis is 9 years old and is very laid back, and his brother, Lanom, is 7 years old. d. Jack and his sister Jill are fraternal twins, and where Jack is very mellow his sister tends to be very emotional.

Operant conditioning is based on

a. the consequences of making a response. b. what happens before we respond. c. an association between two reflexes. d. an association between stimuli.