Basic Biology Terms

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Organism

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

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Cell

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The smallest structural and functional unit of an organism, typically microscopic.

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Unicellular

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Consisting of a single cell.

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Multicellular

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Consisting of multiple cells.

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Stimulus

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A thing or event that evokes a specific functional reaction in an organ or tissue.

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Response

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A reaction to a specific stimulus.

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Spontaneous Generation

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An obsolete theory that living organisms can arise from nonliving matter.

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Homeostasis

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The ability of an organism to maintain a stable internal environment despite changes in external conditions.