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biological species concept
definition of a species as a population or group of populations whose members can breed with one another in nature and produce fertile offspring
condition in which a reproduction barrier keeps two species from interbreeding
separation of populations as a result of geographic change or migration to geographically isolated places
evolutionary model suggesting species often diverge in spurts of relatively rapid change, followed by long periods of little change
study of multicellular organism as they develop from fertillized eggs to fully formed organisms
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