________ is the tendency of groups to make decisions that are more extreme than the decisions that are made by members acting alone

Genetics accounts for about ________ percent of the difference in individuals' personality traits.

a. 20-40 b. 5-10 c. 40-60 d. 70-80

Excessive daytime sleepiness and sudden, uncontrollable attacks of REM sleep are symptoms of __________

a) sleep apnea. b) somniloquy. c) somnambulism. d) narcolepsy.