Vocalizations enable primates to:
a. communicate as humans do.
b. solve distressing situations among primate groups.
c. name resources and monitor the social group.
d. communicate, but only between members of the same hierarchy.
Just before the arrival of the Spanish on Saint Catherines Island, people there:
a. were primarily fishermen.
b. were hunter-gatherers.
c. became the first farmers of the region.
d. were vegetarians by choice.
Human life expectancy in the United States has:
a. increased since 1900, due largely to improvements in medicine and in sanitation.
b. decreased since 1900, because of fast food and sedentary lifestyles.
c. not been affected by nutrition.