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2014-06-27T10:24:04+08:00
The sequence of oxygen, carbon dioxide, and bloodflow can be compared to a car mechanism. the oxygen is the gasoline,the car needs the gasoline to make it start. the carbon dioxide is the smoke the car belches out when it is already moving. and lastly the blood flow is the electricity that travels around the car's parts, it distributes the energy that comes from the gasoline the car got.
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