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| an autotroph, which typically harvests light energy fro the sun; located at the base of the food chain |
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| an organism that obtains its food by eating primary producers; also called an herbivore |
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| an organism that eats primary consumers; also called a carnivore |
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| an organism that feeds on secondary consumers |
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| a consumer that gets its energy fro the remains and waste products of other organisms |
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| a complex model of interconnected food chains in which there are multiple links between species |
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| the amount of solar energy converted to chemical energy by producers of an ecosystem |
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| the rate at which consumers convert chemical energy in food into their own biomass |
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| the percent of energy transferred from one trophic level to the next |
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| the continuous movement of nutrients such as nitrogen, carbon, sulfur, and phosphorus from the physical environment to organisms and back |
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| those species that are in danger of extinction throughout all or a significant portion of their range |
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| those species that are likely to become endangered in the future |
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| a species moved by humans fro a native location to another location |
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| the term to describe organisms that are naturally found only in a particular location |
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| a species whose status provides information on the overall health of an ecosystem |
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| a species within a community that has a role out of proportion to its abundance |
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| the use of living organisms, usually microbes or plants, to detoxify polluted habitats such as dump sites or oil spills |
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