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The remaining explanation involves independent retention of clicks, possibly for tens of thousands of years, in separate populations leading to the present-day San and Hadzabe,” the scientists say. “The deep genetic divergence between the click-speaking groups is consistent with the hypothesis that clicks are an ancient element of human language. If, in fact, San-Hadzabe separation dates back to a time prior to out-of-Africa expansions of modern humans, clicks may be more than 40,000 years old. Under that scenario clicks would have been lost subsequently in most other populations,” they add.
