Chimps, though close relatives of humans, are much stronger than us. What is the best explanation for why that might be?
A. Chimps are more prone to altruism, which requires greater strength.
B. Cooperation among humans reduces the need for individual strength.
C. Sexual selection is weaker in chimps than in humans.
D. Sexual selection is stronger in chimps than in humans.
Answer: B
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Samantha went from sitting to standing to walking and never crawled. Her motor development would be
a. considered still orderly. b. described as an abnormal cephalocaudal development. c. described as an abnormal proximodistal development. d. out of sequence due to excessive training by the parents.
Margaret's newborn baby is crying loudly in the delivery room and has turned pink all over. When a nurse extends the baby's leg, the infant pulls away. Margaret's newborn would score
a. 0 to 3 points on the Apgar scale. b. 4 or 5 points on the Apgar scale. c. 8 to 10 points on the Apgar scale. d. 15 or more points on the Apgar scale.
One prominent theory of antisocial personality disorder suggests that the behaviors are caused by an imbalance between the brain's
A. behavioral inhibition system and fight-or-flight system. B. fight-or-flight system and reward system. C. cortical stimulation system and behavioral inhibition system. D. behavioral inhibition system and reward system.
The main consequence of partial reinforcement is
(a) it works better (b) it proves Darwin was right (c) it makes the response resistant to extinction (d) extinction comes far too easily