When people in developing countries cannot produce enough food to eat, they commonly
A) start poaching.
B) start raising drug-related crops.
C) move to cities or emigrate.
D) begin raising large herds of cattle.
C
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This climate group occupies a greater percentage of the earth's surface than any other climate group
A) polar B) topical C) severe mid-latitude D) dry
The cold water observed along the northern California coast in summer is due mainly to?
a. ?the California current. b. ?oceanic fronts. c. ?upwelling. d. ?cold air moving over the water. e. ?evaporation.
The symbiosis between a fungus and the roots of a tree is an example of ________
A) succession B) trophic cascade C) commensalism D) mutual dependency E) mutualism
Double-blind studies are especially useful in
A. Opinion surveys B. Double-blind studies are not useful in any situation C. Genetic experiments D. Statistical analysis E. Health studies