The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, 1±ÇHurst, 1890 - 501ÆäÀÌÁö |
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116 ÆäÀÌÁö
... extremely few will transmit descendants to a remote futurity . I shall have to return to this subject in the chapter on classification , but I may add that as , according to this view , extremely few of the more ancient species have ...
... extremely few will transmit descendants to a remote futurity . I shall have to return to this subject in the chapter on classification , but I may add that as , according to this view , extremely few of the more ancient species have ...
295 ÆäÀÌÁö
... extremely liable to have their reproductive systems seriously affected . This , in fact , is the great bar to the domestication of ani- mals . Between the sterility thus superinduced and that of hybrids , there are many points of ...
... extremely liable to have their reproductive systems seriously affected . This , in fact , is the great bar to the domestication of ani- mals . Between the sterility thus superinduced and that of hybrids , there are many points of ...
476 ÆäÀÌÁö
... extremely difficult even to conjecture by what gradations many structures have been perfected , more especially among broken and failing groups of organic beings , which have suffered much extinction ; but we see so many strange ...
... extremely difficult even to conjecture by what gradations many structures have been perfected , more especially among broken and failing groups of organic beings , which have suffered much extinction ; but we see so many strange ...
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adapted admit affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied color continued crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favorable females fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate intervals kind lamell©¡ larv©¡ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest oceanic islands offspring organs parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive suppose tend theory tion trees variability variations varieties vary whole widely different wings young