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trait controlled by two or more genes, each or with one or more alleles

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trait controlled by one gene that may have one or more alleles

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body part that share a common function, but not a common structure

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structure that is inherited from ancestors but has lost much or all of its original function

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structure that is similar in different species of common ancestry

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study of past and present distribution of organism

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

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how well an organism survive and reproduce in its environment

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

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evolution of a species genetic changes over long periods of time

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when unrelated organisms develop similar physical characteristics to adapt to comparable ecological niches

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one species may evolve into several species

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theory that proposes that eukaryotic cells formed from a symbiotic relationship among several different prokaryotic cells

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major division of geologic time; usually divided into two or more periods.

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method of determining the age of a fossil by comparing its placement with that fossil in other rock layers

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

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form of reproductive isolation in which two populations are separated by geographic barriers such as rivers mountain, or bodies of water, leading to the formation of two separate subspecies

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heritable characteristic that increases an organism's ability to survive and reproduce in an environment

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preserved remains or traces of ancient organism

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change over time; the process by which modern organisms have descended from ancient organism