“Mere chance … alone would never account for so habitual and large an amount of difference as that between varieties of the same species.”

—  Charles Darwin, book On the Origin of Species (1859)

Source: On the Origin of Species (1859), chapter IV: "Natural Selection", page 111 http://darwin-online.org.uk/content/frameset?pageseq=126&itemID=F373&viewtype=image

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Charles Darwin161
British naturalist, author of "On the origin of species, by… 1809–1882

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