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The basic unit of heredity that consists of a segment of DNA on a chromosome.

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A physical structure that was fully developed and functional in an earlier group of organisms but is reduced and unused in later species.

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A distant or early form of an organism which later forms descend.

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The evolution of a new species from an existing species.

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A characteristic, a behavior, or any inherited trait that makes a species able to survive and reproduce in a particular environment.

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The process through which members of a species that are best suited to their environment survive and reproduce at a higher rate than other members of the species.

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The process through which species change over time; can refer to the changes in a particular population or to the formation and extinction of species over the course of Earth's history.

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One of several periods in Earth's history when large numbers of species became extinct at nearly the same time.

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An organism that is made up of many cells

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The imprint of hardened remains of a plant or animal that lived long ago.

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An organism that is made up of single cell.