As healthy, older adults age, what generally happens to their intelligence?
a. Fluid intelligence declines but crystallized intelligence does not.
b. Crystallized intelligence declines but fluid intelligence does not.
c. Both fluid and crystallized intelligence decline.
d. Neither fluid nor crystallized intelligence decline.
Answer: a
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Concrete operational children understand the law of __________; that is, they understand that the basic properties of substances such as weight and volume stay the same when you change superficial properties such as their shape or arrangement
a. conservation b. effect c. formal operations d. symbolic reasoning