The Origin of Species by Means of Natural Selection Or, The Preservation of Favored Races in the Struggle for LifeD. Appleton and Company, 1882 - 458페이지 |
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v 페이지
... resemble varieties in being very closely , but unequally , related to each other , und in having restricted ranges 33-47 .. CHAPTER III . STRUGGLE FOR EXISTENCE . - - Its bearing on natural selection — The term used in a wide sense ...
... resemble varieties in being very closely , but unequally , related to each other , und in having restricted ranges 33-47 .. CHAPTER III . STRUGGLE FOR EXISTENCE . - - Its bearing on natural selection — The term used in a wide sense ...
xii 페이지
... resemblance of the hair - claspers of the Acarida . The probable use of the rattle to the Rattle - snake . Helmholtz ... resemblances , enlarged and modified . Homological structure of the feet of certain marsupial animals . On serial ...
... resemblance of the hair - claspers of the Acarida . The probable use of the rattle to the Rattle - snake . Helmholtz ... resemblances , enlarged and modified . Homological structure of the feet of certain marsupial animals . On serial ...
13 페이지
... resemble , or are even identical with , those still exist- ing . But this only throws far backwards the history of civilisation , and shows that animals were domesticated at a much earlier period than has hitherto been supposed . The ...
... resemble , or are even identical with , those still exist- ing . But this only throws far backwards the history of civilisation , and shows that animals were domesticated at a much earlier period than has hitherto been supposed . The ...
33 페이지
... resemble varieties in being very closely , but unequally , related to each other , and in having restricted ranges . BEFORE applying the principles arrived at in the last chapter to organic beings in a state of nature , we must briefly ...
... resemble varieties in being very closely , but unequally , related to each other , and in having restricted ranges . BEFORE applying the principles arrived at in the last chapter to organic beings in a state of nature , we must briefly ...
34 페이지
... resemble normal structures in widely different animals . Thus pigs have occasionally been born with a sort of proboscis , and if any wild species of the same genus had naturally possessed a proboscis , it might have been argued that ...
... resemble normal structures in widely different animals . Thus pigs have occasionally been born with a sort of proboscis , and if any wild species of the same genus had naturally possessed a proboscis , it might have been argued that ...
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adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formations formerly forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed theory tion variability variations varieties vary whilst whole wings young