All of the following are long-term challenges associated with high-yield marginal farmlands in the U.S. except:
a. loss of topsoil.
b. high cost of fossil fuel.
c. decreasing salinity of soil.
d. silting of irrigation works.
e. high cost of fresh water.
ANSWER: c
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The dryopithecines were:
A. found only in North and South America. B. ancestors of apes and humans. C. one of the earliest mammal forms. D. Pleistocene ape ancestors.
In former times, the Al-Murra got most of the food they needed by trade or tribute. At present they depend on
A) handouts from the royal princes when they celebrate marriages. B) milking their camels, which now provide their only food. C) dates from palms they plant in the oases. D) distribution of canned foods by the government. E) oil field wages and government salaries.
Using evolution to solve health problems requires medical researchers have training that includes evolutionary theory
a. True b. False Indicate whether the statement is true or false
The development of similar cultural adaptations to similar environmental conditions by people whose ancestral cultures were already rather alike is called:
a. convergent evolution. b. parallel evolution. c. constant evolution. d. adaptation. e. diffusion.