When the CS is repeatedly presented in the absence of the UCS (food, in this case), the CR will "die out" in a process called

Which of the following adolescents is likely to have their first romantic relationship latest among this group?

a. Amber, who is Caucasian b. Elise, who is Latina c. Megan, who is African American d. Irene, who is Asian

The second stage of labor lasts

A) an average of 12 to 14 hours with the first birth and 4 to 6 hours with later births. B) an average of 4 to 6 hours with the first birth and 20 to 50 minutes with later births. C) about 50 minutes for a first birth and 20 minutes with later births. D) about 5 to 10 minutes for a first birth and 90 minutes for later births.