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| biological species concept |
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| Definition of a species as a population or group of populations whose members have the ability to breed with one another in nature and produce fertile offspring |
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| The Major biological changes evident in the fossil record. |
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| condition in which a reproductive barrier keeps two species from interbreeding |
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| separation of populations as a result of geographic change or migration to geographically isolated places |
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| evolution from a common ancestor of many species adapted to diverse environments |
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| evolutionary model suggesting species often diverge in spurts of relatively rapid change followed by long periods of little change |
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| The study of the proc esses of multicellular organisms as they develop from fertilized eggs to fully formed organisms. |
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