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

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

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

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An organism, especially a soil bacterium, fungus, or invertebrate, that decomposes organic material.

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A heterotroph is known as a consumer in the food chain.

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An autotroph or producer, is an organism that produces complex organic compounds from simple substances present in its surroundings, generally using energy from light or inorganic chemical reactions.

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Each of several hierarchical levels in an ecosystem, comprising organisms that share the same function in the food chain and the same nutritional relationship to the primary sources of energy.

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the regions of the surface, atmosphere, and hydrosphere of the earth occupied by living organisms.

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Population ecology is a sub-field of ecology that deals with the dynamics of species populations and how these populations interact with the environment.

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A shallow recess, especially one in a wall to display a statue or other ornament.

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In ecology, a habitat is the kind of natural environment in which a particular organism speicies lives.

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A biotic factor is any living component that affects the population of another organism, or the environment.

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In biology and ecology, abiotic components or abiotic factors are nonliving chemical and physical parts of the environments that effect living organism and functioning of ecosystem.

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A biome is a community of plants and animals that have common characteristic for the environment they exist in.

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An ecosystem is a community of living organisms in conjunction with the non-living components of their environment.