Some drugs that combat depression work by __________
a) increasing the amount of serotonin in the brain.
b) blocking dopamine receptors in the brain.
c) inhibiting the function of the medulla and the pons.
d) increasing the amount of acetylcholine in the brain.
a
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According to Piaget, a key aspect of preoperational thought is ___________, the ability to use a mental symbol, a word, or an object to stand for or represent something that is not physically present
a. operational function c. concrete function b. symbolic function d. formal function
What is a reason that infants who have been sleeping through the night start waking up again between when they are between 18 and 24 months old?
a. They become more aware that they are sleeping by themselves. b. They have more nightmares. c. They watch too much television. d. They drink too many liquids before bedtime.