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In the world of physics, you can distinguish between random motion (e.g. thermal Brownian walk) and directed motion (called ballistic: think of a cannon ball) by studying the mean square displacement of the object: you'll be able to fit this displacement as a function of time by a linear law if it is random, and by a quadratic one if it is directed. ...


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As everybody, I don't fully understand your question. Can you please add your definition of domestication? Would you consider domestication as soon as human can select for heritable traits? If yes, then the question may be split in two: Do all animal populations have heritable traits? Yes! But Depending on what kind of traits you want to consider no ...



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