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13 August, 17:41

What are alveoli and what do they do?

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  1. 13 August, 17:57
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    Alveoli are tiny sacs within our lungs that allow oxygen and carbon dioxide to move between the lungs and bloodstream
  2. 13 August, 21:36
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    Are tiny sac with our lungs that allow oxygen and carbon dioxide to move between the lungs and blood stream
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