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The Origin of Species by Means of Natural Selection: Or, the Preservation of ...
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action adapted advantage allied America amount ancient animals appear become believe birds breeds cause characters climate closely common considered continuous crossed descendants developed difficulty distinct domestic doubt Edition effects Europe existing extinct extremely facts families favourable fertility flowers follow formations forms genera genus geological give given greater groups habits hand Hence hybrids important increase individuals inhabitants inherited insects instance instincts intermediate islands kind known land laws less living look males manner means migration modification namely natural selection nearly never observed occasionally occur organic origin parent perfect period plants points Post 8vo present principle probably produced range 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 young