The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432페이지 |
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55개의 결과 중 6 - 10개
33 페이지
... resemble the two forms of an allied dimorphic species inhabiting another part of the Malay archi- pelago . Thus also with ants , the several worker - castes are generally quite distinct ; but in some cases , as we shall hereafter see ...
... resemble the two forms of an allied dimorphic species inhabiting another part of the Malay archi- pelago . Thus also with ants , the several worker - castes are generally quite distinct ; but in some cases , as we shall hereafter see ...
36 페이지
... resemble species so completely in character , that they have been thus ranked by other highly - competent judges . But to discuss whether they ought to be called species or varieties , before any definition of these terms has been ...
... resemble species so completely in character , that they have been thus ranked by other highly - competent judges . But to discuss whether they ought to be called species or varieties , before any definition of these terms has been ...
42 페이지
... resemble Varieties in being very closely , but unequally , related to each other , and in having restricted ranges . There are other relations between the species of large genera and their recorded varieties which deserve notice . We ...
... resemble Varieties in being very closely , but unequally , related to each other , and in having restricted ranges . There are other relations between the species of large genera and their recorded varieties which deserve notice . We ...
43 페이지
... resemble varieties , for they differ from each other by less than the usual amount of difference . Moreover , the species of the larger genera are related to each other , in the same manner as the varieties of any one species are ...
... resemble varieties , for they differ from each other by less than the usual amount of difference . Moreover , the species of the larger genera are related to each other , in the same manner as the varieties of any one species are ...
84 페이지
... resemble each other in unequal degrees , as is so generally the case in nature , and as is represented in the diagram by the letters standing at unequal distances . I have said a large genus , because as we saw in the second chapter ...
... resemble each other in unequal degrees , as is so generally the case in nature , and as is represented in the diagram by the letters standing at unequal distances . I have said a large genus , because as we saw in the second chapter ...
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accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely facts favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important increase 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 resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young