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2015-06-03T19:11:56+08:00

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When you inhale , oxygen goes in, when you exhale, carbon dioxide released...
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2015-06-04T19:38:43+08:00

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You're breathing. haha

when you inhale, the oxygen comes in and the circulatory system will circulate it to all parts of the body & when you exhale, the carbon dioxide goes out which is already the unneeded air of your body.
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