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Previous edit is not quite correct, disadvantageous traits can become more abundant through random factors such as genetic drift
The fundamental statement of '''natural selection''' is that heritable traits which are beneficial will become more numerous in successive generations, while heritable traits which are harmful will become more scarce. This principle is general, and applies to any system of individuals which reproduce; it is most commonly applied to systems of living organisms. It is always true in those systems because the traits are defined to be beneficial if they become more numerous.
The fundamental statement of '''natural selection''' is that heritable traits which are beneficial will tend to become more numerous in successive generations, while heritable traits which are harmful will tend to become more scarce. This principle is general, and applies to any system of individuals which reproduce; it is most commonly applied to systems of living organisms.
==General Requirements==
==General Requirements==