Biology Basics and Classification

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Organism

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A living thing

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Cell

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The basic unit of structure and function in living things

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Unicellular

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Made of a single cell

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Multicellular

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Consisting of many cells

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Stimulus

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Any change or signal in the environment that can make an organism react in some way

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Response

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An action or change in behavior that occurs as a result of a stimulus

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Spontaneous generation

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The mistaken idea that living things arise from nonliving sources

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Homeostasis

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The condition in which an organism’s internal environment is kept stable in spite of changes in the external environment.

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Characteristics

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Features that help identify something

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Species

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A group of similar organisms that can mate with each other and produce offspring that can also mate and reproduce