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The Origin of Species by Means of Natural Selection: Or the Preservation of ...
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On the Origin of Species by Means of Natural Selection: Or the Preservation ...
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action adapted advantage allied America amount ancient animals appear become believe birds breeds cause chapter characters climate closely common compared considered continuous crossed descended developed difficulty distinct domestic doubt effects existing extinct extremely facts families favourable fertility flowers follow formations forms genera genus geological give given greater groups habits hand Hence hybrids important improved increase individuals inhabitants inherited insects instance instincts intermediate islands kind known land laws less living look males manner means migration modification namely natural selection naturalists nearly never occur offspring organic origin parent perfect period plants points present principle probably produced range ranked reason regions remarked seeds seems seen separated single slight sometimes species sterility structure struggle successive suppose tend theory tion variability variations varieties vary whole widely