One way to test the hypothesis that people are biologically adapted to learn best during a critical period is to ____
a. compare the vocabularies of children and adults
b. determine whether people learn a second language better than a first language
c. determine whether people learn a second language if they start at various ages
d. compare the grammar use of children and adults
c
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A researcher studies the impact of stress on college students' exam scores. Whether the results of this study help us to understand the relationship between stress and work performance in real-life institutions is a question of a. internal validity
b. study confounds. c. external validity. d. the original research hypothesis.
The voluntary command Steve uses to raise his hand in class would be controlled by the __________ nervous system
a. sympathetic b. parasympathetic c. autonomic d. somatic
By the time a man reaches 60 years of age, 90 percent of his peers likely have erectile dysfunction.
Answer the following statement true (T) or false (F)
A neurotransmitter that is involved in the reinforcing effects of opioid agonists is:
a. substance P. b. serotonin. c. glutamate. d. neurotensin.