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2014-06-25T12:41:44+08:00

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Gas exchange happens when we inhale and exhale. We take in the oxygen, and emit carbon dioxide.
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2014-06-25T13:00:35+08:00

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
When we inhale, we take in oxygen and when we exhale we take of carbon dioxide.
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