Among plants, a condition that results in an increase in the number of sets of chromosomes, is called

A. multi-genetics.
B. haploid.
C. polyploidy.
D. diploid.


Answer: C

Environmental & Atmospheric Sciences

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Which of the following is a documented negative impact of dams?

A) decreased rainfall B) alteration of river sediment deposition C) increased atmospheric CFCs D) acid deposition E) alteration of river salinity

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Medical geographers have observed that the world-wide spread of HIV/AIDS from its hearth in Central Africa is best explained by a(n) ________ diffusion pattern

A) expansion B) hierarchical C) contagion D) combination of expansion and hierarchical

Environmental & Atmospheric Sciences

Which of the following statements is true?

a. Temperature inversions occur when a layer of cold air prevents warm air from rising. b. Temperature inversions exacerbate pollution problems. c. Temperature inversions last only a few minutes to a few hours. d. Normally, cool air near Earth's surface expands and rises, carrying pollutants higher into the troposphere. e. Temperature inversions help prevent air pollution.

Environmental & Atmospheric Sciences

The very common carbonate mineral shown here that is a clear to light-gray color is

A. hematite. B. pyrite. C. calcite. D. dolomite. E. magnetite.

Environmental & Atmospheric Sciences