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 274
... young chickens have lost , wholly by habit , that fear of the dog and cat which no doubt was originally instinctive in them ; for I am informed by Captain Hutton that the young chickens of the parent - stock , the Gallus bankiva , when ...
... young chickens have lost , wholly by habit , that fear of the dog and cat which no doubt was originally instinctive in them ; for I am informed by Captain Hutton that the young chickens of the parent - stock , the Gallus bankiva , when ...
Página 276
... young of different ages at the same time ; then the old birds or the fostered young would gain an advantage . And analogy would lead us to believe , that the young thus reared would be apt to follow by inheritance the occasional and ...
... young of different ages at the same time ; then the old birds or the fostered young would gain an advantage . And analogy would lead us to believe , that the young thus reared would be apt to follow by inheritance the occasional and ...
Página 278
... young cuckoo which was actually seen , whilst still blind and not able even to hold up its own head , in the act of ejecting its foster - brothers . One of these was replaced in the nest by the observer , and was again thrown out . With ...
... young cuckoo which was actually seen , whilst still blind and not able even to hold up its own head , in the act of ejecting its foster - brothers . One of these was replaced in the nest by the observer , and was again thrown out . With ...
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Términos y frases comunes
adapted admit affinities allied species America analogous ancient animals appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological 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 marsupial migration modified descendants natural selection naturalists nearly nest occasionally oceanic islands offspring organisation organs Origin of Species parent peculiar perfect pigeon pistil plants pollen present principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion variability variations varieties vary whilst whole wings young