Why can't we breathe underwater?
Humans can't swallow and breathe at the same time once they surpass 9 months of age, and we can never breathe underwater. Why not?
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Key Facts In This Video
Because of water's chemical composition, it can't be breathed by humans. 01:10
Fish are more easily able to consume oxygen underwater because of their gills and cold-blooded nature. 02:06
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