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2014-08-07T17:10:28+05:30
In double circulation ,the heart pumps the blood twice to perform its action.It is the process by which the cardiovascular systems of many vertebrates like mammals circulate blood throughout their bodies.   
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2014-08-07T17:16:31+05:30

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Double circulation is the process in living organism where oxygenated blood and de-oxygenated blood circulates around the body separately(they don ot mix) in two different systems i.e. veins and arteries.
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