Question

why is diffusion insfficient to meet the oxygen requirement multi cellular organism​

Answer 1

Diffusion is a slow process .. as multicellular organism requires more oxygen which can not be full fill by only diffusion

Answer 2

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In multicellular organisms such as man, the volume of the human body is big and hence, oxygen cannot diffuse into all the cells of the human body quickly. ... Hence, diffusion is insufficient to meet the oxygen requirements of multicellular organisms like humans.

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Hope it helps... ¯\_(ツ)_/¯