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
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North America is about 80% urbanized. This mean that 80% of North American
A) cities contain 1 million or more people. B) people live in cities. C) territory is covered with urban structures like streets and commercial buildings. D) resources are used in cities. E) places are cities.
Mutations in sex cells can be induced by ultraviolet radiation or extreme temperature changes
a. True b. False
The only aspect of science is the gathering of information and the studying of that information. Indicate whether the statement is true or false
The pioneer stage of succession is characterized by shade-tolerant plants that prefer consistent temperature and soil moisture.
a. true b. false