In a typical game of "Prisoner's Dilemma," _____ of the choices made by the players are cooperative
a. none
b. about one-third
c. more than half
d. all
Answer: B
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Two weeks after conception, the developing fertilized egg is called a(n) __________.
A. embryo B. fetus C. zygote D. blastocyst
What is the approximate overall rate of infant mortality (defined as death within the first year of life) in the United States?
A. 1 death per 100 live births B. 10 deaths per 1,000 live births C. 100 deaths per 1,000 live births D. 6 deaths per 1,000 live births
People who smoke a pack or more of cigarettes a live an average of how many fewer years than those who don't smoke?
a. one to two b. three to four c. five to six d. six to nine
Since the mid-1990s, the rate of violent crimes in the United States by those under 18 has
A) stayed level. B) climbed sharply. C) declined steadily. D) fluctuated randomly.