why is a closed circulatory system more efficient than an open circulatory system?
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Yes because in closed circulatory system . there is separate paths for oxygenated and deoxygenated blood and intermixing of blood wont happen and that will result in efficient use of blood and release more energy /
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in closed circulatory system blood an flow easily but it is difficult in open circulaory system. and if blood flow easily then we get gd amount of oxygen
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