what about the cyano-bacteria that is the oldest fossil life known: isn't it similar to the stromatolite producing cyano-bacteria of today? If the only difference is arbitrary speciation (non-arbitrary means visible\known separation between two daughter species).
Sure there would be mutations and selections in between, but if at every stage these are no different than the amount of diversity within any species, then are they not the same species? (ie - problem is species definition).
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