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Books Books 11 - 19 of 19 on A structure used only once in an animal's life, if of high importance to it, might....  
" A structure used only once in an animal's life, if of high importance to it, might be modified to any extent by natural selection; for instance, the great jaws possessed by certain insects, used exclusively for opening the cocoon, — or the hard tip... "
The Origin of Species
by Charles Darwin - 19?? - 238 pages
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Evolution and adaptation

Thomas Hunt Morgan - Science - 1903 - 470 pages
...this way. We come now to a point that touches the theory of natural selection in a very vital spot. " It may be well here to remark that with all beings...individuals better adapted to their conditions of Me than any of those which happened to survive. So again a vast number of mature animals and plants,...
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The Library of Original Sources, Volume 9

Oliver Joseph Thatcher - Encyclopedias and dictionaries - 1907
...in the adult may affect the structure of the larva ; but in all cases natural selection will insure that they shall not be injurious : for if they were...better adapted to their conditions of life than any of those which happened to survive. So again a vast number of mature animals and plants, whether or not...
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The Library of Original Sources, Volume 9

Oliver Joseph Thatcher - Encyclopedias and dictionaries - 1907
...selected, the thickness of the shell being known to vary like every other structure. It may be \vell here to remark that with all beings there must be...selection. For instance a vast number of eggs or seeds arc annually devoured, and these could be modified through natural selection only if they varied in...
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The Origin of Species

Charles Darwin - Evolution - 1909 - 551 pages
...another species ; and though statements to this effect may be found in works of natural history, I carmot find one case which will bear investigation. A structure...better adapted to their conditions of life than any of those which happened to survive. So again a vast number of mature animals and plants, whether or not...
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The Science-history of the Universe, Volume 5

Francis Rolt-Wheeler - Science - 1909
...for opening the cocoon ; or the hard tip to the beak of unhatched birds, used for breaking the egg. "It may be well here to remark that with all beings...better adapted to their conditions of life than any of those which happened to survive. So again, a vast number of mature animals and plants, whether or not...
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The science-history of the universe, Volume 5

Francis Rolt-Wheeler - 1909
...for opening the cocoon ; or the hard tip to the beak of unhatched birds, used for breaking the egg. "It may be well here to remark that with all beings...eggs or seeds would, perhaps, if not destroyed, have vielded individuals better adapted to their conditions of life than any of those which happened to...
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The Library of Original Sources: 1833-1865

Oliver Joseph Thatcher - Encyclopedias and dictionaries - 1915
...instance, the great jaws possessed by certain insects, used exclusively for opening the cocoon—or the hard tip to the beak of unhatched birds, used...better adapted to their conditions of life than any of those which happened to survive. So again a vast number of mature animals and plants, whether or not...
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American Socialists and Evolutionary Thought, 1870-1920

Mark Pittenger - Political Science - 1993 - 310 pages
...conflicted with Darwin's own attempt to show that nature was anything but economical in its operations, that "there must be much fortuitous destruction, which...no influence on the course of natural selection." 18 Simons's insistence that this biological misconception illustrated a social law underscored the...
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The Nick of Time: Politics, Evolution, and the Untimely

Elizabeth Grosz - Philosophy - 2004 - 314 pages
...that overall, statistically, but not in each individual case, select the more fit from the less fit: It may be well here to remark that with all beings...better adapted to their conditions of life than any of those which happened to survive. So again a vast number of mature animals and plants, whether or not...
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