'en: Natural selection acts only by taking advantage of slight, sucessive variations. She can never take a great and sudden leap, but must advance by short and sure, though slow steps.
"On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life," 1859, s. 157-162.
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Charles Darwin
(1809–1882) britský prírodovedec, autor knihy "O pôvode druhov prostredníctvom prirodzeného výberu"