The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 1890 - 458페이지 |
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64 페이지
... climate seems at first sight to be quite independent of the struggle for existence ; but in so far as climate chiefly acts in reducing food , it brings on the most severe struggle between the indi ' viduals , whether of the same or of ...
... climate seems at first sight to be quite independent of the struggle for existence ; but in so far as climate chiefly acts in reducing food , it brings on the most severe struggle between the indi ' viduals , whether of the same or of ...
133 페이지
... climate , or conversely . So again , many succulent plants cannot endure a damp climate . But the degree of adaptation of species to the climates under which they live is often overrated . We may infer this from our frequent inability ...
... climate , or conversely . So again , many succulent plants cannot endure a damp climate . But the degree of adaptation of species to the climates under which they live is often overrated . We may infer this from our frequent inability ...
134 페이지
... climate , though in all ordinary cases we assume such to be the case ; nor do we know that they have subsequently ... climate of Faroe in the north and of the Falklands in the south , and on many an island in the torrid zones . Hence ...
... climate , though in all ordinary cases we assume such to be the case ; nor do we know that they have subsequently ... climate of Faroe in the north and of the Falklands in the south , and on many an island in the torrid zones . Hence ...
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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 lamellæ larvæ 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