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any alteration in the structure or function of an organism or any of its parts that results from natural selection and by which the organism becomes better fitted to survive and multiply in its environment

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the formation of new and distinct species in the course of evolution.

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the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.

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the branch of biology and medicine concerned with the study of embryos and their development.

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hide or disguise the presence of a person, animal, or object by means of camouflage.

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any difference between cells, individual organisms, or groups of organisms of any species caused either by genetic differences

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reduction in the intensity of light or other radiation as it passes through a medium or object, due to absorption, reflection, and scattering.

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a group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding.

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the process whereby organisms better adapted to their environment tend to survive and produce more offspring.

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The mechanisms of evolution include natural selection acting on the genetic variation among individuals, mutation, migration and genetic drift.