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    There are minor variations in DNA-controlled attributes between individuals within species. If it were not so, we would all look identical. And DNA alters slightly during the lifespan of an organism. Natural selection means that organisms with attributes better adapted to their environment will predominate, while the weaker will die out. Eventually, these imperceptible changes in DNA, generation by generation, will lead to a new species. We see it all the time with micro-organisms in which a generation is as little as 10 minutes. 50,000 generations of Clostridium perfringens bacteria takes 12-18 months, during which time they can mutate to become drug-resistant, effectively becoming a new species. Likewise the influenza virus.

    50,000 human generations is over a million years. Natural selection has resulted in today's Hom. Sap. being very different from our ancestors. In the last 2 millennia human size has increased on average by 15%. By how much might the race have changed over the previous 1000? Or over a billion years?

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