Which substage of sensorimotor development serves as a transition to the symbolic thought of the next stage?
a. tertiary circular reaction
b. secondary circular reaction
c. invention of new means through mental combinations
d. coordination of secondary schemes
C
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Which disorder is often accompanied by "free-floating" anxiety?
a) panic b) acrophobia c) generalized anxiety disorder d) obsessive-compulsive disorder
According to research into sexuality during adolescence, which of the following is true regarding teenagers and sex?
a) more girls than boys have had at least one sexual partner by the time they are in 12th grade b) more girls than boys report that they have had more than four sexual partners by the time they reach 12th grade c) research has found that girls who get pregnant while still in high school are most likely to be either freshmen or sophomores when they become pregnant d) the rate of sexually transmitted diseases in teenagers is much higher in girls than it is in boys