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This activity contains 26 questions.

Question 1
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The study and protection of biological diversity is _____.
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Question 2
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Extinction is a naturally occurring phenomenon. Scientists now worry more about extinctions because _____.
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Question 3
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In the United States, _____ of all prescriptions contain substances derived from plants.
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Question 4
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In addition to endangered species, the U.S. Endangered Species Act provides protection for _____.
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Question 5
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The major cause of extinction of species today is _____.
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Question 6
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The species most at risk of extinction due to habitat destruction are those _____.
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Question 7
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Why is the ozone layer important?
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Question 8
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The accumulation of _____ in the atmosphere bears primary responsibility for the destruction of ozone.
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Question 9
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Why does biological magnification occur?
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Question 10
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The signature effect of increasing greenhouse gases in the atmosphere is _____.
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Question 11
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In the past 100 years, global temperatures have risen about _____.
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Question 12
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The two major contributors to the increase in atmospheric carbon dioxide levels are _____.
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Question 13
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The figure below provides information about the increase in atmospheric concentrations of carbon dioxide, nitrous oxide, and methane. Because of the importance of increased amounts of these gases, scientists predict _____.

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Question 14
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Global warming is having a significant effect on _____.
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Question 15
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It may be possible for some organisms to cope with global climate change by _____.
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Question 16
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When a population is fragmented into smaller subpopulations, it may _____.
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Question 17
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The small-population approach to understanding extinction views the _____ as being the factor that ultimately drives it to extinction.
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Question 18
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The breeding habitat of the red-cockaded woodpecker is maintained by _____.
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Question 19
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The survival of fragmented populations often depends on the movement of individuals through _____.
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Question 20
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Regions with high concentrations of species, especially species that are endangered or threatened, are referred to as _____.
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Question 21
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Hot spots, such as rain forests and dry shrublands, which make up less than _____ of Earth's land surface, are home to about _____ of all plant and vertebrate species.
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Question 22
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Species found in only one place on Earth are _____ species.
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Question 23
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The "zoned reserve" concept of landscape management calls for _____.
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Question 24
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An initiative that attempts to preserve the web of life in connected areas of the Rocky Mountains of Canada and the northern United States is called the _____.
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Question 25
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_____ is the science of facilitating the return of a degraded ecosystem to a more natural condition.
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Question 26
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When commercial fishermen agree to catch less fish than they can so that the fish population will not be put in danger of extinction, the fishermen can be said to be practicing _____.
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