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प्रश्न
Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans
थोडक्यात उत्तर
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उत्तर
Unlike the unicellular organisms, the multi-cellular organisms have complex body structures with specialized cells and tissues to perform various necessary functions of the body. Since these cells are not in direct contact with surrounding environment so, simple diffusion cannot meet the oxygen requirement of all these cells.
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