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VARIATION UNDER DOMESTICATION
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The Origin of Species by Means of Natural Selection: Or, the Preservation of ...
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according acquired action adapted advantage amount animals appear beak become bees believe birds breeds called cause cells chapter characters climate closely colour common considered continued crossed descendants developed difficulty distinct domestic doubt effects eggs existence extinct extremely facts favourable flowers forms genera genus give given greater groups habits Hence highly important improved increase individuals inhabitants inherited insects instance instincts intermediate kind known laws less living look males manner marked means modified namely natural selection naturalists nearly nest never object observed occasionally occur organs origin parent perfect period pigeons plants points present preserved principle probably produced races rank rarely reason relation remarked resemble respect result seeds seems seen shown side similar slight sometimes species structure struggle supposed tend tion tree variability variations varieties vary whole widely young