Каким воздухом мы дышим?

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Рамачарака писал: «Человек может прожить некоторое время без еды, труднее ему быть без воды, но лишь несколько минут он может прожить без обновления воздуха в легких посредством дыхания».
Возникает вопрос, каким воздухом мы дышим?

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