Evolution occurs between generations. Genetic mutation happens all the time. The only reason it seems to take forever to happen is that it takes that long for it to happen to enough groups of people for it to be noticeable.
If someone mutates in a way that doesn't suit its environment, it will probably die. If the mutuation is harmless or good, it probably won't die.
And chiQ - breasts are a lot more than just a food source for infants.
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