If the marginal ________ of an action exceeds its marginal ________ then the action ________ be performed.
A) cost; benefit; should B) benefit; cost; should not
C) benefit; cost; should D) none of the above
C) benefit; cost; should
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In the United States, the middle class constitutes approximately 40 percent of the population
a. True b. False
All of the following statements about sexual behavior among the Trobrianders is correct except:
a. when the couple is ready to be married, they appear outside the woman’s household. b. by their mid-teens, young people begin having longer-term affairs that lead to marriage. c. young people traditionally have a great deal of sexual freedom. d. by the age of 7 or 8, they begin playing erotic games and imitating adults. e. by the early teens, they begin pursuing sexual partners.
The allele HbS that codes for the type of hemoglobin associated with sickle-cell anemia
A. is never expressed in the phenotype when present in a homozygous state. B. is distributed evenly throughout all human populations. C. has no effect on the viability of a population. D. is always lethal when found in a human population. E. is less susceptible to malaria.
Which of these factors is NOT considered to have influenced the initial evolution of bipedal locomotion in hominins?
a. carrying objects. b. seed and nut gathering. c. long-distance walking. d. visual surveillance. e. overgrown limbs.