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Is it even remotely possible, Jack, that these examples might represent
different organisms that developed and died out rather than a progressive
"improvement" of a single organism? How does one test the hypothesis?
Sure, it's a likely explanation for what we can observe, but can we be
certain that there is no other possible explanation for the observations?
Would it be inconsistent, for example, for these to be "dead ends" stemming
FROM a "human" precursor? Tied up in all this, of course, is our degree of
confidence in dating technology.