Natural Selection Vocabulary Test

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Extinction

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A term that typically describes a species that no longer has any known living individuals.

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Habitat

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The natural home or environment of an animal, plant, or another organism.

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Adaptation

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An inherited trait that improves survival and reproductive success of an organism, can be structural, behavioral, or physiological.

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Natural Selection

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Process by which individuals that are better suited to their environment survive and reproduce most successfully; also called survival of the fittest.

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Mutation

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Any event that changes genetic structure; source of variation; can be beneficial or harmful to an organism.

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Species

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A group of organisms that can interbreed and produce fertile offspring.

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Variation

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Differences in physical traits of an individual from the group to which it belongs.

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Survival of the Fittest

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A phrase that summarizes the process of natural selection, where the best adapted individuals survive.

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Genetic Drift

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A mechanism of evolution that refers to random changes in the frequency of alleles in a population.

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Phenotype

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The physical expression of an organism's genes, including traits such as color, shape, and behavior.