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We can breathe air because the lungs have a very large surface area so enough oxygen can diffuse into our bodies to support us. In water there is dissolved oxygen, but at a much lower concentration than in air, and we simply can't absorb it fast enough.

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8y ago
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8y ago

Because our lungs use 'gas exchange' to swap carbon dioxide for fresh oxygen.

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Q: Why can't you breathe water to stay alive?
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