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" As many more individuals of each species are born than can possibly survive ; and as, consequently, there is a frequently recurring straggle for existence, it follows that any being, if it vary however slightly in any manner profitable to itself, under... "
The Origin of Species by Means of Natural Selection: Or, The Preservation of ... - Página xxi
por Charles Darwin - 1889
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Evolution

Discovery
...frequently recurring struggle for existence, it follows that any being, if it vary in any manner Hfc profitable to itself, under the complex and sometimes...varying conditions of life, will have a better chance ofsun'ival and thus be naturally selected. From the strong principle of inheritance, any selected variety...
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