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 129
... seen in duns , and I have seen a trace in a bay horse . My son made a careful examination and sketch for me of a dun Belgian cart - horse with a double stripe on each shoulder and with leg - stripes ; I have myself seen a dun Devonshire ...
... seen in duns , and I have seen a trace in a bay horse . My son made a careful examination and sketch for me of a dun Belgian cart - horse with a double stripe on each shoulder and with leg - stripes ; I have myself seen a dun Devonshire ...
Página 144
... seen and heard it hammering the seeds of the yew on a branch , and thus breaking them like a nuthatch . In North America the black bear was seen by Hearne swimming for hours with widely open mouth , thus catching , almost like a whale ...
... seen and heard it hammering the seeds of the yew on a branch , and thus breaking them like a nuthatch . In North America the black bear was seen by Hearne swimming for hours with widely open mouth , thus catching , almost like a whale ...
Página 169
... seen in this chapter how cautious we should be in concluding that the most different habits of life could not graduate into each other ; that a bat , for instance , could not have been formed by natural selection from an animal which at ...
... seen in this chapter how cautious we should be in concluding that the most different habits of life could not graduate into each other ; that a bat , for instance , could not have been formed by natural selection from an animal which at ...
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