Why is circulatory system essential in multi cellular animals
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Because without that the oxygen won't be able to reach all body parts and provide energy. Thus without circulatory system, life is not possible
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Multicellular organisms have developed transport and circulatory systems to deliver oxygen and food to cells and remove carbon dioxide and metabolic wastes. Sponges are the simplest animals, yet even they have a transport system.
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Hope it helps... ¯\_(ツ)_/¯
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