Chimps have not paid the price of speech (vulnerability to chocking and noisy sleep). Chimps could never speak with a British accent. For them, the natural has set specific limits on this form of cultural interaction.According to a theory proposed by Terence Davidson, M.D. (Department of Otolaryngology, U.C. San Diego)... human vulnerability to sleep apnea, as well as the risk of choking, is the price our species paid (in evolutionary terms) for the rich repertoire of sounds we can make with our voice. In other words, sleep apnea is the price we paid for our ability to speak. The modification of the human airway has generated such enormous advantages for survival through improved communication that the overall benefits have been well worth the risks. But evolutionary adaptation can involve significant tradeoffs.
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