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 14
... Hence the supposed aboriginal stocks must either still exist in the countries where they were originally domesticated , and yet be unknown to ornithologists ; and this , considering their size , habits , and remarkable characters ...
... Hence the supposed aboriginal stocks must either still exist in the countries where they were originally domesticated , and yet be unknown to ornithologists ; and this , considering their size , habits , and remarkable characters ...
Página 93
... hence in the diagram I have chosen the extreme species ( A ) , and the nearly extreme species ( I ) , as those which have largely varied , and have given rise to new varieties and species . The other nine species ( marked by capital ...
... hence in the diagram I have chosen the extreme species ( A ) , and the nearly extreme species ( I ) , as those which have largely varied , and have given rise to new varieties and species . The other nine species ( marked by capital ...
Página 94
... Hence very few of the original species will have transmitted offspring to the fourteen - thousandth generation . We may suppose that only one , ( F ) , of the two species ( E and F ) which were least closely related to the other nine ...
... Hence very few of the original species will have transmitted offspring to the fourteen - thousandth generation . We may suppose that only one , ( F ) , of the two species ( E and F ) which were least closely related to the other nine ...
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