The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeCollier Books, 1962 - 512 páginas |
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Página 31
... extremely slight or strongly marked , which appear amongst many individuals living together , may be con- sidered as the indefinite effects of the conditions of life on each individual organism , in nearly the same manner as the chill ...
... extremely slight or strongly marked , which appear amongst many individuals living together , may be con- sidered as the indefinite effects of the conditions of life on each individual organism , in nearly the same manner as the chill ...
Página 128
... extremely few will transmit descendants to a remote futurity . I shall have to re- turn to this subject in the chapter on Classification , but I may add that as , according to this view , extremely few of the more ancient species have ...
... extremely few will transmit descendants to a remote futurity . I shall have to re- turn to this subject in the chapter on Classification , but I may add that as , according to this view , extremely few of the more ancient species have ...
Página 459
... extremely difficult even to conjecture by what gradations many structures have been perfected , more especially amongst broken and failing groups of organic beings , which have suffered much extinction , but we see so many strange ...
... extremely difficult even to conjecture by what gradations many structures have been perfected , more especially amongst broken and failing groups of organic beings , which have suffered much extinction , but we see so many strange ...
Contenido
An Historical Sketch | 15 |
Introduction | 25 |
Variation Under Nature | 58 |
Derechos de autor | |
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The Origin of Species by Means of Natural Selection: Or, The ..., Volumen2 Charles Darwin Vista de fragmentos - 1972 |
Términos y frases comunes
accumulated adapted admit affinities allied species America analogous ancient appear 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 eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation 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 offspring organisation organs Origin of Species parent peculiar perfect pigeons pistil pollen present principle probably produced progenitor 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