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Although the available evidence is spotty and its interpretation (i) _______, what evidence there is does seem to indicate (ii) ______ human health and nutrition in the cultural transition from the Paleolithic to the Mesolithic periods in the Old World, a transition that occurred, with regional variations, roughly 12,000 to 18,000 years ago. For although there are doubts about just how to interpret some of this evidence, there are no data to (iii) _______ it, to suggest progress in nutrition or an improvement in health.
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