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 92
... inhabitants will almost immediately undergo a change , and some species will probably become extinct . We may conclude , from what we have seen of the intimate and complex manner in which the inhabitants of each country are bound ...
... inhabitants will almost immediately undergo a change , and some species will probably become extinct . We may conclude , from what we have seen of the intimate and complex manner in which the inhabitants of each country are bound ...
Página 114
... inhabitants of the reunited continent will again have been changed ; and again there will have been a fair field for natural selection to improve still further the inhabitants , and thus to produce new species . That natural selection ...
... inhabitants of the reunited continent will again have been changed ; and again there will have been a fair field for natural selection to improve still further the inhabitants , and thus to produce new species . That natural selection ...
Página 380
... inhabitants of the north , these would take the places of the former inhabitants of the temperate regions . The latter , at the same time , would travel further and further southward , unless they were stopped by barriers , in which ...
... inhabitants of the north , these would take the places of the former inhabitants of the temperate regions . The latter , at the same time , would travel further and further southward , unless they were stopped by barriers , in which ...
Contenido
An Historical Sketch | 15 |
Introduction | 25 |
Variation Under Nature | 58 |
Derechos de autor | |
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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