Which of the following is true of modern hunter-gatherer societies?
a. Their life expectancies have increased more than the lifespans of urbanized societies.
b. The benefits of the hunter-gatherer diet and lifestyle have been offset by the deaths associated with accidents.
c. Individuals in hunter-gatherer societies are physiologically different from urbanized societies.
d. Pollution from urban areas has contaminated their sources of animal proteins, resulting in widespread famines.
B
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D. all of the above
In Rosenthal's investigation of expectancy effects in the classroom, before he
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a. 20% b. 40% c. 60% d. 80%