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On the Origin of Species by Means of Natural Selection: Or, the Preservation ...
No preview available - 2018
according admit affinity allied America ancient animals appear areas become believe belonging birds cause certain changes characters climate closely common complex considered continent crossed deposited descended difficulty distant distinct species doubt effects embryo Europe evidence existing explained extent extinct extremely fact families fertility flowers follow formations former formerly forms fossils genera genus geological give given Glacial groups habits hand hybrids important individuals inhabitants inherited insects instance intermediate intervals islands kinds known land less living look mammals manner means migration modified mountains namely natural selection naturalists nearly occur oceanic offspring organs parent perfect period plants points present probably produced progenitor range recent regions remains remarked resemblance respect rudimentary seeds seems separated similar single South stage sterility structure successive suppose theory variations varieties various whole widely