Charles Darwin about evolution (“On The Origin of Species”, 1859) - On the ordinary view of each species having been independently created, why should specific characters, or those by which the species of the same genus differ from each other, be more variable than the generic characters in which they all agree?
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On the ordinary view of each species having been independently created, why should specific characters, or those by which the species of the same genus differ from each other, be more variable than the generic characters in which they all agree?
 Charles DarwinOn The Origin of Species (1859). copy citation

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