The folate hypothesis
a. contradicts the importance of the relationship between UV radiation and skin cancer.
b. purports to explain why dark skin is advantageous in high UV environments.
c. CANNOT explain why dark skin is advantageous in high UV environments.
d. explains why dark-skinned individuals often have rickets.
e. explains why leaves fall in autumn.
b
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What subsistence strategy characterized most of human history?
A) horticulture B) irrigation agriculture C) food collection D) pastoralism
Which of the following is NOT a factor in the emergence and spread of dangerous infectious diseases like HIV/AIDS, Ebola, West Nile, SARS, Lyme disease, and Zika?
A. spillovers from humans to wildlife B. modern air travel C. population increase D. changing settlement patterns E. commercial expansion
The secular trend in growth is the result of a reduction in the impact of disease and __________
a. better nutrition b. more exposure to sunlight c. pollutants d. natural selection
Which of the following best describes the role of hydraulic systems in state formation?
A. Mesolithic states developed so that they could build irrigation systems. B. Irrigation began in China and spread along ancient trade routes. C. States were the by-products of the organizational requirements of large irrigation systems. D. In Europe, irrigation provided the advantage that allowed anatomically modern humans to displace Neandertals. E. Irrigation systems favored democracy.