Conservation requires:
a. the ability to reverse one's thinking.
b. the ability to focus on two or more aspects of a situation at once.
c. concrete operational thinking.
d. all of these.
D
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The ability to mentally operate on an object and to change it is referred to as
a. transference. b. telegraphic thought. c. transformation. d. telepathy.
Twins Sammy and Josiah always act more silly when they are together. Thus, their behavior has ______.
A. consensus B. consistency C. distinctiveness D. covariance
Small, irritating and frustrating events faced in daily life are referred to as
a. regressions. b. conflicts. c. hassles. d. burnouts.
If cells taken from the ectoderm are grown in isolation, they form skinlike tissues; if they are grown with mesoderm cells, they form nervous system tissue. This observation suggests that cell development is
a. controlled by a purely genetic process. c. affected by the immediate environment. b. inherently unpredictable. d. less structured before birth.