Organism, Any living thing, Cell, Basic unit of structure and function in living things, Unicellular, Single-celled organism, Multicellular, Organisms consisting of many cells, Stimulus, Any change or signal in the environment that can make an organism react in some way, Response, An action or a change in behavior, Spontaneous Generation, The mistaken idea that living things arise from nonliving sources, Homeostasis, The maintenance of stable internal conditions.

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