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" Why should not Nature take a sudden leap from structure to structure? On the theory of natural selection, we can clearly understand why she should not; for natural selection acts only by taking advantage of slight successive variations; she can never... "
Charles Darwin's Works: The origin of species by means of natural selection ... - Стр. 244
авторы: Charles Darwin - 1896
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Christian Reformer, Том 1

1886 - Страниц: 400
...Selection acts only by taking advantage of slight successive variations ; she can never take a great, sudden leap, but must advance by short and sure, though slow, steps." If we ask Mr. Danvin once more to consider what the facts of Nature teach in this respect, he replies...
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On the Origin of Species by Means of Natural Selection, Or, The Preservation ...

Charles Darwin - 1866 - Страниц: 668
...natural selection acts only by taking advantage of slight successive variations ; she can never take a sudden leap, but must advance by short and sure though...natural selection acts by life and death, — by the preservation of individuals with any favourable variation, and by the destruction of those with any...
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The American Naturalist, Том 43

1909 - Страниц: 846
...for natural selection selects only by taking advantage of slight successive variations; sue can never take a great and sudden leap, but must advance by short and sure, though slow steps. In attempting to explain the puzzling phenomenon of the so-called neuter, really undeveloped female...
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The Origin of Species by Means of Natural Selection: Or, The Preservation of ...

Charles Darwin - 1873 - Страниц: 492
...for natural selection acts only by taking advantage of slight successive variations ; she can never take a great and sudden leap, but must advance by...slow steps. Organs of little apparent Importance, as a/ected by Natural Selection. As natural selection acts by life and death,—by the survival of the...
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Proceedings of the American Philosophical Society Held at ..., Объемы 12-13

American Philosophical Society - 1873 - Страниц: 626
..."Natural selection acts only by taking advantage of slight successive variations ; she can never take a sudden leap, but must advance by short and sure, though slow, steps." Ib. 190. "New variations are very slowly formed, for variation is a slow process, and natural selection...
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Proceedings of the American Philosophical Society Held at ..., Объемы 12-13

American Philosophical Society - 1873 - Страниц: 662
..."Natural selection acts only by taking advantage of slight successive variations ; she can never take a sudden leap, but must advance by short and sure, though slow, steps." Ib. 190. " New variations are very slowly formed, for variation is a slow process, and natural selection...
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On the origin of species by means of natural selection ; or, The ...

Charles Darwin - 1875 - Страниц: 504
...for natural selection acts only by taking advantage of slight successive variations ; she can never take a great and sudden leap, but must advance by...Organs of little apparent Importance, as affected by Katural Selection. As natural selection acts by life and death, — by the survival of the fittest,...
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Proceedings of the American Philosophical Society Held at ..., Объемы 12-13

American Philosophical Society - 1878 - Страниц: 642
...Natural selection acts only by taking advantage of slight successive variations ; she can never take a sudden leap, but must advance by short and sure, though slow, steps." Ib. 190. " New variations are very slowly formed, for variation is a slow process, and natural selection...
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The Problem of Human Life: Embracing the "evolution of Sound" and "evolution ...

Alexander Wilford Hall - 1877 - Страниц: 546
...— "Natural selection acts only by taking advantage of slight successive variations. She can neiir take a great and sudden leap, but must advance by short and sure though slow steps." — Origin tj Species, p. 156. Then, it follows, as there are no two species in the world, and never...
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The Problem of Human Life: Embracing the "evolution of Sound" and "evolution ...

Alexander Wilford Hall - 1880 - Страниц: 544
..."Natural selection acts only by taking advantage of slight successive variations. She can never tahe a great and sudden leap, but must advance by short and sure though slow steps." — Origin of Species, p. 156. Then, it follows, as there are no two species in the world, and never...
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