The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, 1권Hurst, 1890 - 501페이지 |
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182 페이지
... belonging to distinct families had slowly be- come adapted to live more and more out of water , and to breathe the air . For these species , from belonging to dis- tinct families , would have differed to a certain extent , and in ...
... belonging to distinct families had slowly be- come adapted to live more and more out of water , and to breathe the air . For these species , from belonging to dis- tinct families , would have differed to a certain extent , and in ...
350 페이지
... belonging to some one group has seized on the place occupied by a species belonging to a distinct group , and thus have caused its extermination . If many allied forms be developed from the successful intruder , many will have to yield ...
... belonging to some one group has seized on the place occupied by a species belonging to a distinct group , and thus have caused its extermination . If many allied forms be developed from the successful intruder , many will have to yield ...
445 페이지
... belonging to several distinct groups , before they had diverged to their present extent , accidentally resem- bled a ... belong . ing to the larger genera , tend to inherit the advantages which made the groups to which they belong large ...
... belonging to several distinct groups , before they had diverged to their present extent , accidentally resem- bled a ... belong . ing to the larger genera , tend to inherit the advantages which made the groups to which they belong large ...
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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