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2015-07-11T14:50:58+08:00

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OXYGEN
carbon dioxide-is the wastes gas that is produced when cardon is combined with oxygen as part of the bodies energy-making processes.The lungs and the respirtory system allow oxygen in the air to be taken into the body,while also enabling the body to get rid of carbon dioxide in th air breathed out....

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2015-07-12T13:07:53+08:00