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Abiotic

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Non-living chemical and physical parts of the environment that affect living organisms and the functioning of ecosystems.

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Biotic

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Living components of an ecosystem, such as plants and animals.

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Commensalism

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A relationship between two organisms where one benefits and the other is neither helped nor harmed.

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Competition

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An interaction between organisms or species in which both the organisms or species are harmed.

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Consumer

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An organism that feeds on plants or other animals for energy.

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Decomposer

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

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Ecology

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The branch of biology that deals with the relations of organisms to one another and to their physical surroundings.

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Ecosystem

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A biological community of interacting organisms and their physical environment.

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Food Web

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A system of interlocking and interdependent food chains.

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Limiting Factor

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An environmental factor that tends to limit population size.