Biology Concepts: Evolution

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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.

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Natural Selection

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The process by which organisms that are better adapted to their environment tend to survive and produce more offspring.

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Adaptation

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A trait that helps an organism survive and reproduce in its environment.

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Species

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

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Mutation

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A change in the DNA sequence that can lead to changes in traits.

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Fossil

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The preserved remains or traces of a once-living organism.

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Genetic Variation

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Differences in DNA among individuals within a species.

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Common Ancestor

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An ancestor that two or more descendants have in common.

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Extinction

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The end of an organism or a group of organisms.

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Speciation

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