why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans?
(I WANT 1MARKS ANSWER)
Mayuresh22:
because in human most of cells are not in direct contact with surface
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Because all cells are not in direct contact with environment.
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because multicellular organism donor have all the cells in the contact with environment so simple diffusion is insufficient to meet the oxygen requirement of multicellular organism
thanks but I want small answer
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