why is diffusion insufficient to meet the oxygen requirements of multicellular organism like humans?
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Explanation:
In multicellular organism only the cells of the skin are in direct contact with the environment and cells of the rest of the body are not in direct contact with the environment.
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In multicellular organisms like humans, all the body cells are not in direct contact with the surrounding environment . Thus , every cell of the body will not get oxygen as by the process of diffusion from the environment .
Therefore diffusion is insufficient to meet
the oxygen requirements of multicellular
organisms .
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