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The key to defining evolution is the use of the word fittest. The simple darwinian misquote "survival of the fittest" is tautologous. In the case of nature, selection occurs towards traits which help an animal survive, so fittest in this sense means most likely to survive. "Survival of those most likely to survive" is hardly an astounding thesis, and so I would like to emphasise that when defining the evolution of a system, it is very important to define what the purpose of the sytem is, and therefore what it means to be fit.
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