What has replaced the native biodiversity that was contained in prairie ecosystems in the central part of the U.S.?
What will be an ideal response?
monoculture farms
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Rapid changes of a magnetic field induces
A) a magnetic field of greater magnitude. B) a magnetic field of the same magnitude. C) an electric field.
A group of countries that agree to control the market by limiting production in order to drive up prices is
A) a cartel. B) a world bank. C) an ITCZ. D) an ecumene.
Which of the following is a characteristic of a perfect pesticide?
A. is inexpensive B. affects only target organisms C. a short life D. All of these are correct.
The pattern of absorbance of solar energy by the atmosphere includes
A. absorbance of infrared radiation by carbon dioxide and water vapor. B. a remarkable uniformity in the proportion of different kinds of wavelengths absorbed by ozone. C. heavy absorbance of visible light by carbon dioxide.