Levels of Ecological Organization

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Organism

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An individual living entity that can react to stimuli, reproduce, grow, and maintain homeostasis.

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Population

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A group of organisms of the same species living in a particular area at the same time.

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Community

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An assemblage of different populations that live together in a defined area.

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Ecosystem

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A biological community of interacting organisms and their physical environment.

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Biome

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A large community of plants and animals that occupies a distinct region defined by its climate and ecosystems.

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Biosphere

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