25. A sleep disorder characterized by falling asleep suddenly many times a day is ____. (A)insomnia (B) narcolepsy (C) apnea (D)cataplexy

14. By pairing the ringing of the bell with the presentation of meat, Pavlov trained dogs to salivate to the sound of a bell even when no meat was presented.In this experiment, the presentation of the meat was the _______. (A)unconditioned response (B) conditioned response (C) unconditioned stimulus (D)conditioned stimulus