The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432 páginas |
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Página 26
... developed in some slight degree in an unusual manner , or a pouter till he saw a pigeon with a crop of somewhat unusual size ; and the more abnormal or unusual any character was when it first appeared , the more likely it would be to ...
... developed in some slight degree in an unusual manner , or a pouter till he saw a pigeon with a crop of somewhat unusual size ; and the more abnormal or unusual any character was when it first appeared , the more likely it would be to ...
Página 63
... developed , -yet of those which do survive , the best adapted individuals , supposing that there is any variability in a favourable direction , will tend to propagate their kind in larger numbers than the less well adapted . If the ...
... developed , -yet of those which do survive , the best adapted individuals , supposing that there is any variability in a favourable direction , will tend to propagate their kind in larger numbers than the less well adapted . If the ...
Página 84
... developed orders . In the Australian mammals , we see the process of diversification in an early and incomplete stage of development . The Probable Effects of the Action of Natural Selection through Divergence of Character and ...
... developed orders . In the Australian mammals , we see the process of diversification in an early and incomplete stage of development . The Probable Effects of the Action of Natural Selection through Divergence of Character and ...
Página 90
... developed , have now become extinct . Looking still more remotely to the future , we may predict that , owing to the continued and steady increase of the larger groups , a multitude of smaller groups will become utterly extinct , and ...
... developed , have now become extinct . Looking still more remotely to the future , we may predict that , owing to the continued and steady increase of the larger groups , a multitude of smaller groups will become utterly extinct , and ...
Página 91
... developed in each flower ; whereas other botanists , probably with more truth , look at the plants which have their several organs much modified and reduced in number as the highest . If we take as the standard of high organisation ...
... developed in each flower ; whereas other botanists , probably with more truth , look at the plants which have their several organs much modified and reduced in number as the highest . If we take as the standard of high organisation ...
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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 continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely facts favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids 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 occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced 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