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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51 페이지
... widely diffused within their own country ( and this is a different consideration from wide range , and to a certain extent from commonness ) , oftenest give rise to varieties sufficiently well - marked to have been recorded in botanical ...
... widely diffused within their own country ( and this is a different consideration from wide range , and to a certain extent from commonness ) , oftenest give rise to varieties sufficiently well - marked to have been recorded in botanical ...
423 페이지
... widely . Nor is it meant that the species in such genera have , on an average , a very wide range ; for this will ... widely , as in the case of certain powerfully - winged birds , will necessarily range widely ; for we should never ...
... widely . Nor is it meant that the species in such genera have , on an average , a very wide range ; for this will ... widely , as in the case of certain powerfully - winged birds , will necessarily range widely ; for we should never ...
457 페이지
... widely different purposes in the adult state . So again it has been shown that generally the embryos of the most distinct species belonging to the same class are closely similar , but become , when fully developed , widely dissimilar ...
... widely different purposes in the adult state . So again it has been shown that generally the embryos of the most distinct species belonging to the same class are closely similar , but become , when fully developed , widely dissimilar ...
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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