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?

03:22

Key Facts In This Video

  • 1

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

  • 2

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

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Breathing

Water

Climate

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