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A feeding hierarchy in which organisms in an ecosystem are grouped into trophic (nutritional) levels and are shown in a succession to represent the flow of food energy and the feeding relationships between them.

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A graphical model showing the interconnecting food chains in an ecological community.

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Parasitism describes a relationship between two organisms where one benefits, and the other is harmed.

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A relationship between individuals of two species in which one species obtains food or other benefits from the other without either harming or benefiting the latter.

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Mutualism is the way two organisms of different species exist in a relationship in which each individual benefits from the activity of the other.

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Symbiotic relationships are a special type of interaction between species. Sometimes beneficial, sometimes harmful.

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Decomposers are organisms that break down dead or decaying organisms.

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An organism that generally obtains food by feeding on other organisms or organic matter.

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An autotrophic organism capable of producing complex organic compounds

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The trophic level of an organism is the position it occupies in a food chain.

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The biosphere is the zone of air, land and water where organisms exist.

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An interacting group of various species in a common location.

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A community of animals, plants, or humans among whose members interbreeding occurs.

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An organism's role in it's environment.

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A place where an organism or a biological population normally lives or occurs.

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A factor created by a living thing or any living component within an environment.

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A nonliving condition or thing, as climate or habitat, that influences or effect the organisms in it.

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A large community of plants and animals that occupies a specific region.

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A biological community of interacting organisms and their physical environment.