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 90
... modified condition , some producing two or three varieties , and some failing to produce any . Thus the varieties or modified descendants of the common parent ( A ) , will generally go on increasing in number and diverging in character ...
... modified condition , some producing two or three varieties , and some failing to produce any . Thus the varieties or modified descendants of the common parent ( A ) , will generally go on increasing in number and diverging in character ...
Página 174
... modified at the same time through variation and natural selection ? But there is no necessity for supposing that all the parts of any being have been simultaneously modified . The most striking modifications , excellently adapted for ...
... modified at the same time through variation and natural selection ? But there is no necessity for supposing that all the parts of any being have been simultaneously modified . The most striking modifications , excellently adapted for ...
Página 407
... modified through natural selection for different habits . Then , from the many slight successive variations having supervened in the several species at a not early age , and having been inherited at a corresponding age , the young will ...
... modified through natural selection for different habits . Then , from the many slight successive variations having supervened in the several species at a not early age , and having been inherited at a corresponding age , the young will ...
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