Endorphins are
A. associated with the "fight or flight" response.
B. neurotransmitters released by the brain.
C. found in heart muscle.
D. chemically identical to morphine.
Answer: B
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Which statement best illustrates the "tragedy of the commons?"
A. A factory pollutes a river as much as the law allows. B. Some levels of pollution are life threatening. C. Some activities harm the environment, but others do not. D. Irrigated cropland can be ruined by salinization. E. Cropland can decrease biodiversity.
The size of a stream channel depends on the
A) stream channel's load. B) gradient of the stream. C) stream velocity. D) All of the above
Effects of NAFTA include
A) forcing Mexican corn farmers into bankruptcy. B) more than 600,000 U.S. jobs were lost. C) undocumented border crossings have increased steadily. D) all of the above. E) none of the above.
Suppose you have a choice of fuels to use to heat your home. Which CO2 source produces the least carbon per unit of energy?
A. Natural gas B. Oil C. Coal