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== Liên kết ngoài ==
{{Wikispecies|Species}}
* http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/S/Speciation.html {{Webarchive|url=https://web.archive.org/web/20160613040040/http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/S/Speciation.html |date=2016-06-13 }}
* [http://www.sciencedaily.com/releases/2003/12/031231082553.htm 2003-12-31, ScienceDaily: Working On The 'Porsche Of Its Time': New Model For Species Determination Offered] Quote: "...two species of dinosaur that are members of the same genera varied from each other by just 2.2 percent. Translation of the percentage into an actual number results in an average of just three skeletal differences out of the total 338 bones in the body. Amazingly, 58 percent of these differences occurred in the skull alone. "This is a lot less variation than I'd expected", said Novak..."
* [http://www.sciencedaily.com/releases/2003/08/030808081854.htm 2003-08-08, ScienceDaily: Cross-species Mating May Be Evolutionarily Important And Lead To Rapid Change, Say Đại học Indiana Researchers] Quote: "...the sudden mixing of closely related species may occasionally provide the energy to impel rapid evolutionary change..."
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