One way to reduce energy use is to find more efficient ways to provide electricity. About what percentage of the energy in coal is lost during the generation and transmission of electricity?
A) 20% B) 30% C) 50% D) 70%
D
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Sustainable agriculture utilizes methods that
A. do not deplete soil and water resources. B. cause wind and soil erosion. C. sustain constant yields of crops. D. None of these statements are correct.
The functioning of which of the following explains the rapid mutation of HIV?
A) the way the protease functions B) the way the reverse transcriptase functions C) both a and b D) neither a nor b
A community may undergo a regime shift or a phase shift when ________
A) it has too many symbiotic relationships among species B) pollutants cause a rapid rise in mutations C) it loses a keystone species or suffers a major climatic change D) all invasive and exotic species are removed E) it suffers a natural fire or flood
A vesicular igneous texture indicates that
A. the rock cooled slowly. B. the ash and pumice were hot and became compacted. C. the rock cooled quickly. D. there was a lot of gas in the magma. E. the rock broke apart as it flowed.