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 189
... 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 distinct families , would have differed to a certain extent , and in ac ...
... 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 distinct families , would have differed to a certain extent , and in ac ...
Página 343
... belonging to some one group has seized on the place occupied by a species belonging to a distinct group , and thus have caused its extermi- nation . If many allied forms be developed from the successful intruder , many will have to ...
... belonging to some one group has seized on the place occupied by a species belonging to a distinct group , and thus have caused its extermi- nation . If many allied forms be developed from the successful intruder , many will have to ...
Página 430
... belonging to the larger genera , tend to inherit the advantages which made the groups to which they belong large and their parents domi- nant , they are almost sure to spread widely , and to seize on more and more places in the economy ...
... belonging to the larger genera , tend to inherit the advantages which made the groups to which they belong large and their parents domi- nant , they are almost sure to spread widely , and to seize on more and more places in the economy ...
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