Question

why is diffusion insufficient to meet the oxygen requirement of multicellular organisms like humans?​

Answer 1

HEY MATE....

Diffusion, being a slow process will take a lot of time to circulate oxygen to all the body cells. Hence, diffusion is insufficient to meet the oxygen requirements of multicellular organisms like humans

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Answer 2

Answer:

diffusion being slow process which take lot of time to circulate the oxygen to all body parts so that oxygen requirement O2