Dictionary of Human Evolution and Biology

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1. a unit of biological improvement from an evolutionary point of view comprising a group of individuals, populations, or species similar in their level of organization, but not necessarily a clade. Primates are usually graded, for example, into prosimians, tarsiers, monkeys, apes, and humans.

2. an evolutionary level of development in a particular structure, physiological process, or behavior occupied by a species or group of species.

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