The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for LifeD. Appleton, 1904 - 435 páginas |
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Página 1
... called by one of our greatest philosophers . On my return home , it occurred to me , in 1837 , that something might perhaps be made . out on this question by patiently accumulating and reflecting on all sorts of facts which could ...
... called by one of our greatest philosophers . On my return home , it occurred to me , in 1837 , that something might perhaps be made . out on this question by patiently accumulating and reflecting on all sorts of facts which could ...
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... called the same genera are lineal descendants of some other and generally extinct species , in the same manner as the acknowledged varieties of any one species are the de- scendants of that species . Furthermore , I am convinced that ...
... called the same genera are lineal descendants of some other and generally extinct species , in the same manner as the acknowledged varieties of any one species are the de- scendants of that species . Furthermore , I am convinced that ...
Página 9
... called monstrosities arise ; but monstrosities cannot be separated by any distinct line from slighter variations . All such changes of structure , whether extremely slight or strongly marked , which appear amongst many individuals ...
... called monstrosities arise ; but monstrosities cannot be separated by any distinct line from slighter variations . All such changes of structure , whether extremely slight or strongly marked , which appear amongst many individuals ...
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... called the indirect ac- tion of changed conditions , namely , through the repro- ductive system being affected , we may infer that vari- ability is thus induced , partly from the fact of this system being extremely sensitive to any ...
... called the indirect ac- tion of changed conditions , namely , through the repro- ductive system being affected , we may infer that vari- ability is thus induced , partly from the fact of this system being extremely sensitive to any ...
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... called by gardeners ; that is , of plants which have suddenly produced a single bud with a new and sometimes widely different character from that of the other buds on the same plant . These bud variations , as they may CHAP . I ...
... called by gardeners ; that is , of plants which have suddenly produced a single bud with a new and sometimes widely different character from that of the other buds on the same plant . These bud variations , as they may CHAP . I ...
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Términos y frases comunes
adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period 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 males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young