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the term evolution not so much means just changes of genetic designs, but assumes there is a special purpose, an meaningful intention behind the changes: to make a species fitter.
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no, evolution is a random process. in a group of organisms, there will be some with various mutations. some of these mutations incur a survival benefit -- those particular mutations increase in the population as a result of that survival benefit, and eventually the entire species consists of organisms with that mutation. there is no "intent," no "meaning."