Evolution can be regarded as an algorithm that repeatedly produces a new generation of designs from a previous generation such that the average fitness of the designs increases from generation to generation. The new generation is produced by asking the fittest designs in the current generation to reproduce themselves. The reproductions aren't exact, however. Chance mutations make some of the new designs superior (and some inferior) to their parent designs. The fitness of a design is determined by a selection process such as a competition or a test.
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