why there is need of circulatory system in higher multicellular organism
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In higher multicellular organisms there is high energy requirement and each and every cell needs energy to perform various complex functions of higher organisms. Therefore they need a well defined circulatory system in order to meet the requirements of each and every cell of the body. Unicellular organisms can live with simple diffusion as they have only one cell which is in the direct contact with the Earth, but in multicellular organisms not all cells are in direct contact with the surroundings therefore diffusion will not satisfy every cell needs. Therefore circulatory system is crucial in higher multicellular organisms.
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