In the United States, the use of synthetic pesticides has increased 10-fold between 1942 and 1997 . For the same time period, the crop loss to insects has

a. declined by 10%
b. increased by 2%
c. almost doubled from 10% to 13%
d. stayed at exactly the same percentage
e. declined by 50%


C

Environmental & Atmospheric Sciences

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a. true b. false

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North America is about 80% urbanized. This mean that 80% of North American

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