Owing to this struggle for life, any variation, however slight and from whatever cause proceeding, if it be in any degree profitable to an individual of any species, in its infinitely complex relations to other organic beings and to external nature, will tend to the preservation of that individual, and will generally be inherited by its offspring. The offspring, also, will thus have a better chance of surviving.
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Original Citation
Darwin, Charles. On the Origin of Species. London: John Murray, 1859, ch. 3.
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Current Citation
Darwin, Charles. On the Origin of Species, edited by William Bynum. Penguin Classics, 2009, ch. 3.
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