I’ve always wondered this since I was a child, and I see people use bags to rebreathe the air they have in their lungs for panic attacks, which only increases my curiosity.
In: Biology
We could….for a little while.
We *do* breathe out some of the oxygen we breathe in, but we do consume some of it. More importantly, we’d also be breathing in our expelled carbon dioxide, which is bad, as you might imagine.
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