The existence of easy, difficult, and slow-to-warm-up children is considered evidence for

a. early critical periods in development.
b. lasting effects of the intrauterine environment.
c. affective needs in infancy.
d. hereditary differences in temperament.

ANSWER: d

Psychology

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"Black tar" is

A. a name given heroin from Mexico that is brown or black in its pure form. B. a type of street heroin that has been "cut" with powdered charcoal. C. a synthetic opioid that is twice as potent as pure heroin. D. an opium extract that is imported from Southeast Asia.

Psychology

The height of a vertical bar is used to represent the frequency of occurrence of scores in a _____

a. simple frequency distribution b. stem-and-leaf plot c. histogram d. frequency polygon

Psychology