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incipient speciestype specimenquantum speciationreproductive isolationallopatric speciationanagenesiscladogenesischaracter displacementgenetic changehybridizationadaptationextinctioncoevolutionemergencenatural selectionselectionvariationmosaic evolutioncreative evolutionparallel evolution
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Theodosius Dobzhansky
American scientist

Johann Christian Fabricius
Danish entomologist