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24 March, 20:46

The 30 trillion or so cells in your body require a continuous supply of oxygen and nutrients and an unending removal of waste materials. the blood carries these materials in the body's circulation within a series of closed tubes, called

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  1. 24 March, 22:17
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    Sounds like Your cardiovascular system, the closed tubes must be your blood vessels, siencey term: your Angio, which means blood vesels
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