America's indigenous peoples were the first cultivators of what percentage of the crops grown in the world today?
a. 10
b. 30
c. 60
d. 80
Question 2
Over the course of our evolutionary history, most environmental stressors were climatic and geographic. Now, however:
a. humans have little environmental stressors, climatic or geographic.
b. nonhuman primates have more stressors than humans.
c. humans face a series of new environmental stressors of their own making.
d. humans also face daily weather stressors.
e. humans have climatic stress, but geographical stress has been removed because of technology.
Distribution of glaciers in North America (a) in the late twentieth century, and (b) 18,000 years ag
world percentage of religion
In American Progress (1872), John Gast depicts a feminized (and eroticized) America moving westward,
Distribution of zebra and quagga mussels in North America in 2014
Percentage & Molarity
Percentage of higher-income Canadian households