Define closed circulatory system
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Vertebrates, and a few invertebrates, have a closed circulatory system.Closed circulatory systems have the blood closed at all times within vessels of different size and wall thickness. In this type of system, blood is pumped by a heart through vessels, and does not normally fill body cavities.
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in this bloods are closed in vessels of different sizes and wall thickness,.in this bloods are pumped by heart by thickness of body
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