Pesticide use has tripled in the past 40 years, yet pests still cause extensive damage to crops. Why has this increased use of pesticides not been more effective?
A) Increases in ultraviolet radiation and global warming break down pesticides faster.
B) The widespread use of pesticides has resulted in the evolution of pesticide-resistant pests.
C) The pesticides in use today are much less powerful due to government regulations.
D) The pesticides available are no longer suited for the most common types of pests.
B
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Which of the following statements describes the roof of a home where snow melts readily?
A. It is a poor conductor of heat. B. It is a good radiator of heat. C. It is a poor radiator of heat. D. It is a good conductor of heat.
Hurricanes are
A) cold-core systems with high pressure aloft. B) cold-core systems with low pressure is a. C) warm-core systems with high pressure aloft. D) warm-core systems with low pressure aloft.
Irregularities in coastal outlines are least affected by
A) joints. B) bedding planes. C) rock strength. D) age of rock.
An environmental or political feature that hinders migration is
A) a visa. B) a pull factor. C) a push factor. D) an intervening obstacle. E) both a pull and push factor.