On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeEaston Press, 1976 - 470 páginas |
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Página 124
... common progenitor , for it can rarely have happened that natural selection will have modified several distinct species , fitted to more or less widely- different habits , in exactly the same manner : and as these so - called generic ...
... common progenitor , for it can rarely have happened that natural selection will have modified several distinct species , fitted to more or less widely- different habits , in exactly the same manner : and as these so - called generic ...
Página 125
... common progenitor , as have the two sexes of any one species . Consequently , whatever part of the structure of the common progenitor , or of its early descendants , became variable , variations of this part would , it is highly ...
... common progenitor , as have the two sexes of any one species . Consequently , whatever part of the structure of the common progenitor , or of its early descendants , became variable , variations of this part would , it is highly ...
Página 393
... common progenitor , and that both groups have since undergone much modification in divergent directions . On either view we must suppose that the bizcacha has retained , by inheritance , more of the characters of its ancient progenitor ...
... common progenitor , and that both groups have since undergone much modification in divergent directions . On either view we must suppose that the bizcacha has retained , by inheritance , more of the characters of its ancient progenitor ...
Contenido
VARIATION UNDER NATURE | 30 |
STRUGGLE FOR EXISTENCE | 45 |
NATURAL SELECTION | 59 |
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Términos y frases comunes
accumulated adapted admit affinities allied species America ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common progenitor continuous crossed crustaceans degree developed difficulty distinct species divergence doubt effects eggs embryo existing exterminated extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period gradations greater number groups of species habits Hence hybrids hybrids produced 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 offspring organisation organs Origin of Species parent peculiar perfect pigeons pistil plants pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds slight South America stamens sterility structure struggle successive supposed swimbladder theory variability variations varieties vary whilst whole wings young