The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, Volume 1 |
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acquired action adapted advantage allied amount animals appear beak become bees believe birds breeds called cause cells chance chapter characters closely colour common considered continued crossed descended developed difficulty distinct domestic doubt edition effects eggs existing extremely facts favourable flowers follows forms genera genus give given greater groups habits Hence highly important improved increase individuals inhabitants inherited insects instance instincts kind known laws less living look males manner marked means modified namely natural selection naturalists nearly nest never object observed occur organic origin parent perfect period pigeons plants points present preserved principle probably produced pupae races rarely reason relation remarked respect result seeds seems seen shown side similar single slight sometimes species structure struggle successive supposed tend tion trees variability variations varieties vary whole widely wild young