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Species
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Group of organisms that are alike in many ways.
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Population
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Group of individuals of the same species found in a given area.
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Community
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Populations of living organisms that interact with one another in an ecosystem.
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Ecosystem
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Group of living organisms that interact with one another as one unit.
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Biome
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Geographic region of Earth that is inhabited by a community of distinct types of plant and animal species.
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Biosphere
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Layer of soil, water and air that sustain life.
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Biotic
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Living components of an ecosystem.
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Abiotic
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Nonliving physical and chemical parts of an ecosystem.
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Habitat
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Place where a particular species lives.
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Niche
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The role an organism plays in an ecosystem.
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Producer
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Organism that uses elements from the environment to make its own food.
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Primary Consumer
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Herbivore or omnivore that eats plants.
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Secondary Consumer
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Carnivore or omnivore that feeds on primary consumers.
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Tertiary Consumer
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Organism that eats secondary and primary consumers.
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Decomposer
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Type of bacteria or fungus that breaks down dead organisms and wastes.
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