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something produced by adapting: an adaptation of a play for television. 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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A fossil is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, hair, petrified wood, oil, coal, and DNA remnants.

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Embryology is the branch of biology that studies the prenatal development of gametes, fertilization, and development of embryos and fetuses.

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the disguising of military personnel, equipment, and installations by painting or covering them to make them blend in with their surroundings.

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In biology and ecology, extinction is the termination of an organism or of a group of organisms, normally a species.

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In biology and ecology, extinction is the termination of an organism or of a group of organisms, normally a species.

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Exploring the latest in scientific discoveries from prehistoric life to missions to Mars.

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group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding. The species is the principal natural taxonomic unit, ranking below a genus and denoted by a Latin binomial, e.g., Homo sapiens.

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Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations.

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Evolution is change in the heritable characteristics of biological populations over successive generations.