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| a large proportion of earths organisms become extinct in a relatively short period of geologic time. |
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| a species that faces extinction in all or part of its range |
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| a species that remains restricted to the area where it evolved |
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| species likely to become endangered in the near future |
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| conversion of a grassland or woodland to desert. |
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| low-ph rain formed when sulfur dioxide and nitrogen oxides mis with water vapor in the atmosphere |
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| an organism accumulates increasing amounts of a chemical pollutant in its tissues over the course of its lifetime. |
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| a chemical pollutant becomes increasingly concentrated as it moves up through food chains |
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| substance that is released as result of human activities and harms organisms or disrupts natural processes |
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| high atmospheric layer rich in ozone; prevents most ultraviolet radiation in sunlight from reaching earths surface |
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| of a region, the genetic variation within its species, variety of species, and variety of ecosystems |
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| field of applied biology that surveys and documents biodiversity and seeks ways to maintain and use it. |
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| actively altering an area in an effort to restore or create a functional ecosystem |
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| threatened region with great biodiversity that is considered a high priority for conversation efforts |
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