Why open type circulatory system is not found in large animal
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The open type of circulatory system is not found in large animals because large organisms need more oxygen for their survival.
The large animals have a complex body and needs oxygen to distant part of body parts. A closed system is more efficient because of the driving force of the pressure that allows the blood (oxygenated) to reach each and every organ of the body.
Hence in this way closed circulatory system is much efficient than open circulatory system.
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