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Biosphere

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The global sum of all ecosystems, where all life on Earth exists.

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Ecosystems

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A biological community of interacting organisms and their physical environment.

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Biotic

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Relating to or resulting from living organisms.

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Abiotic

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

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Communities

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Groups of different species living together in a particular area, interacting with each other.

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Populations

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Groups of individuals belonging to the same species that live in the same region at the same time.

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Species

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A group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding.

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Habitats

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The natural environment in which a particular species lives.

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Biomes

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Large naturally occurring communities of flora and fauna occupying a major habitat.