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2014-06-18T19:05:00+08:00

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Gas exchange happens when we inhale and exhale. We take in the oxygen, and emit carbon dioxide.
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2014-06-18T19:43:02+08:00

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The esophagus, because when you are inhaling the esophagus will close because of the epiglottis it opens the esophagus when you eats 
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