Diffusion is insufficient to meet the the oxygen requirements of multicellular organisms like human. State reason.
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Diffusion is unable to meet the oxygen requirements of multi-cellular organisms such as humans because diffusion is one of the slow processes. That is a lot of time is required for oxygen to circulate to all the cells of the body. ... Therefore, through diffusion, it becomes difficult for oxygen to reach all the cells
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Because in multicellular organism all the cells are not in direct contact with surrounding environment
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