Let's say an isolated population on an island started to evolve separately from the rest of mankind. At what point and how would we tell when this had become a separate species from the rest of us? Could it be said this has happened already but this issue is too politically charged to allow us to say it has happened already. For instance if the only two populations of homo sapiens were the short pygmies in Africa and the large Eskimos in the Arctic. Might someone be tempted to argue they came from different species? If not why not?
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