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a change or the process of change by which an organism or species becomes better suited to its environment.

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

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fossil record definition. A term used by paleontologists ( see paleontology ) to refer to the total number of fossils that have been discovered, as well as to the information derived from them.

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evolutionary change within a species or small group of organisms, especially over a short period.

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a different or distinct form or version of something.

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the state or process of a species, family, or larger group being or becoming extinct.

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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. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution.

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the process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth.