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 Speciesby Charles Darwin - 19?? - 238 pagesNo preview available
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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...