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Why can't we breathe underwater?

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

  1. Because of water's chemical composition, it can't be breathed by humans. 01:10

  2. Fish are more easily able to consume oxygen underwater because of their gills and cold-blooded nature. 02:06

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