why is diffusion insufficient to meet the oxygen required in multicellular organisms
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because human being has a very complex body design and all the cells are not in direct contact with the atmosphere
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In multicellular organisms, only the cells of skin are in direct contact with the environment and cells of rest of the body are not in direct contact with the environment. Thus, if all the raw materials required to sustain life are transported by the process of diffusion it will take a very long time to reach all parts of the body. To overcome this problem, multicellular organisms have specific organ system for the transport of various substances like digested food, oxygen, carbon dioxide, water and other waste products.
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