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change in allele frequencies as a result of the migration of a small subgroup of a population.

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body part that shares a common function, but not a common structure.

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structure that is similar in different species of common ancestry.

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selective breeding of plants and animals to promote the occurrence of traits in an offspring.

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how well an organism can survive and reproduce in its environment

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random change in allele frequency caused by a series of chance occurrences that causes a allele to become more or less in the population.

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natural selection in which individuals at the upper and lower ends of the curve have higher fitness.

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all genes including different alleles, that are present in a population at any one time.

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timeline used to represent Earth's history.

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geological processes, such as continental drift, resulting from plate movement.

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process by which organisms that are most suited to their environment survive and reproduce.

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length of time required for half of the radioactive atoms in a sample to decay.

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distinctive fossil that is used to compare the relative ages of fossils.

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process by which a single species or a small group of species evolves into several different forms.

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process by which two species evolve in response to changes in each other over time.

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division of geologic time into which eras are subdivided.

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division of two or more periods.

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an organism's ability to survive and reproduce to its environment.

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ancient remains that are left behind.
sentence: Fossils can be found in different types of rocks around the world.

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the change over time.
sentence: Natural selection was based upon Darwin's theory, evolution.