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How was respiration understood historically?

Asked by gorillapaws (30513points) December 13th, 2019

Before scientists understood the basic mechanism of respiration, with oxygen being absorbed and CO2 being exhaled, how did people think about respiration? Certainly they were aware of suffocating. I’m sure people died in mines and other enclosed spaces where CO2 built up to dangerous levels. Did they think it was magic?

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