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

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process by which unrelated organisms independently evolve similarities when adapting to similar environments

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term used to refer to a species that has died out

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form of reproductive isolation in which two populations reproduce at different times

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form of reproductive isolation in which two populations are separated physically by geographic barriers

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form of reproduction isolation where two populations have differences in courtship rituals or other types of behavior that prevent them from interbreeding

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separation of species or populations so that they cannot interbreed and produce fertile offspring

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formation of a new species

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An event that drastically reduces the size of a population

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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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random change in allele frequencies that occurs in small populations

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form of natural selection in which a single curve splits into two; upper and lower ends of a distribution curve have higher fitness than individuals near the middle

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form of natural selection by which the center of the curve remains in its current position; center of a distribution curve have higher fitness than individuals at either end

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natural selection form, individuals at one end of a distribution curve have higher fitness than individuals in the middle/end

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organ that serves no useful function in an organism

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Similar in unrelated organisms, they evolved to do the same job not because they were inherited from a common ancestor

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Structures that have different mature forms in different organisms, but develop from the same embryonic tissues

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An organism's ability to survive and reproduce in their environment

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Ancient animal remains or evidence that are preserved

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The process that living organisms  go through where they change over time, modern organisms descended from ancient organisms.

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One species in the ancestor or the oldest creature of two/more species later in time;all things living come from common ancestors

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Individuals that're better suited to their environment will reproduce and survive successfully

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The increase of an organism's chance of survival based on inherited characteristics