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a hierarchical series of organisms each dependent on the next as a source of food.

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a system of interlocking and interdependent food chains.

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the practice of living as a parasite in or on another organism

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the doctrine that mutual dependence is necessary to social well-being.

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an association between two organisms in which one benefits and the other derives neither benefit nor harm.

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interaction between two different organisms living in close physical association, typically to the advantage of both.

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A decomposer is an organism that decomposes, or breaks down, organic material such as the remains of dead organisms.

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A heterotroph is an organism that cannot manufacture its own food by carbon fixation and therefore derives its intake of nutrition from other sources of organic carbon, mainly plant or animal matter.

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an organism that is able to form nutritional organic substances from simple inorganic substances such as carbon dioxide.

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A position in a food chain or Ecological Pyramid occupied by a group of organisms with similar feeding mode

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All of the ecosystems of the earth.

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An ecological unit composed of a group of organisms or a population of different species occupying a particular area, usually interacting with each other and their environment

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A group of organisms of one species that interbreed and live in the same place at the same time

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the place or environment where a plant or animal naturally or normally lives and grows

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Biotic factors are the living parts of an ecosystem.

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Abiotic factors are non-living factors in an ecosystem.

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a habitat supplying the factors necessary for the existence of an organism or species

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a major ecological community type (such as tropical rain forest, grassland, or desert)

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the complex of a community of organisms and its environment functioning as an ecological unit