why there is need for transportation system for carrying oxygen and food from one side of body to another
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Circulatory SystemFunctions of the Circulatory SystemTypes of blood cellsExcretory SystemCirculatory SystemYou have learnt earlier that all organisms need food, water and oxygen for survival. They need to transport all these to various parts of their body. Further, animals need to transport wastes to parts from where they can be removed. Have you wondered how all this is achieved? Do you see the heart and the blood vessels? They function to transport substances and together form the circulatory system.
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