When identical twins who are raised apart, in separate adoptive homes, show the same susceptibility to a given psychological disorder, it indicates that:
a. environmental factors have more influence than genetic factors in the disorder
b. both genetics and environmental factors contribute equally to the disorder
c. genetic factors have more influence than environmental factors in the disorder
d. neither genetic factors nor environmental factors contribute to the disorder
C
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Research on the onset of puberty has revealed that ________
a. the average age of menarche now occurs at about 15 years old. b. the average age at puberty is increasing in Europe and North America. c. menarche depends on a critical level of body fat. d. there is little variability in the time of puberty onset.
It is extremely rare for people to recall events that occurred before the age of ______
a. two c. four b. three d. five