[luckyme]

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I think the near ubiquitous tendency of various populations to form self contained breeding groups which share strongly related phenotypes, is sufficient to justify species classifications.

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It only works because all the people between 5ft and 7ft died off so now it's easier to point to "tall people" and "short people".

Ring species mirror the morphing of evolution and the useful but troublesome 'naming of species' issue. Looked back over time we are all ring species.

luckyme