Because Joseph was perceived by other students as the class clown, he began disrupting class more and more to get laughs from his peers. The other students' expectations for his behavior created a(n):

After Pavlov's dogs became conditioned to salivate at the sound of the metronome, he experimented with sounding the metronome and then failing to present the dogs with any food right away. Soon they stopped salivating to the sound of the metronome

This represents the process called a. acquisition. b. testing. c. extinction. d. spontaneous recovery. e. shaping.

AIDS is transmitted primarily through _____

a) blood, vaginal fluid, semen. b) blood only. c) skin to skin contact. d) kissing.