As societies became larger, humans devised new cultural systems to ____
a. weed out the weakest members
b. foster innovation
c. promote rugged individualism
d. maintain group cohesion
ANSWER:
d
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The concordance rate of schizophrenia among twins is ____
a. higher in dizygotic than monozygotic twins b. higher in monozygotic than dizygotic twins c. equally high in monozygotic and dizygotic twins d. very difficult to determine
____ are the baby's earliest vocalizations other than crying, and they appear by the age of two months
a. Babbles b. Transformational lexical phonemes c. Prelinguistic fast-mappers d. Coos
Internal validity is: a. the extent to which the results of an experiment can be attributed to the manipulation of the dependent variable, rather than to some confounding variable
b. the extent to which the results of an experiment can be attributed to the manipulation of the independent variable, rather than to some confounding variable. c. the extent to which the results of an experiment can be generalized. d. both b and c
Monozygotic twins
A) have the same genetic makeup. B) develop more rapidly than children of single births. C) are no more alike than ordinary siblings. D) tend to be healthier than children of single births.