Why is a system of transportation/circulation necessary for organisms?
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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.To become larger, they need specialized organs and organ systems.
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It is necessary to dilever food and oxygen to all the parts of the body of the organism and to remove wastes products like carbon dioxide and nitrogenous substances.
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