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Smallest unit of a habitat that is occupied by an organism. A habitat niche is the physical space occupied by the organism; an ecological niche is the role the organism plays in the community of organisms found in the habitat. The activities of an organism and its relationships to other organisms are determined by its particular structure, physiology, and behaviour.
This entry comes from Encyclopædia Britannica Concise. For the full entry on niche, visit Britannica.com.