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When two or more species effect each other's revolution through natural selection

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Two separate evolutionary lines that have alike structures

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When a species no longer exists

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Two species that mate at different times

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Animals cannot breed if they live in different places

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They cannot breed if they are attracted to each other

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animals that are not able to breed successfully due to genetics

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Development of a new species

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when a species is drastically reduced to the point that they can still carry on.

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when a small group of individuals become isolated from the larger group of the population.

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a change in the gene pool of a small population

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favors both extreme ends of the spectrum.

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over representation of a specific trait

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(Natural Selection) when nature causes a species to change toward one trait end of the spectrum.

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A feature that no longer seems to have a purpose.

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Similar structures with different origins

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organs or skeletal structures that resemble the ancestors of the organism.

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An ancestor that two or more family members have in common

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Natural Selection (Survival of the Fittest)

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Natural Selection (Survival of the Fittest)

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when populations of organisms adapt to change

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when a species changes to fit the environment

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when a species is fit to survive the environment

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A trace or impression of an organism that has been preserved by the earth's crust

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inherited change in a population of species