Question

why is diffusion insufficient to meet the oxygen require ments of multicellular organisms ??​

Answer 1

Diffusion is insufficient to meet the oxygen requirement of multicellular organisms like human because all the cells are not direct contact in environment and diffusion is a slow process. ... In the end, it would be too slow and impractical for any multicellular organism to use.

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Answer 2

In multicellular organisms like humans, all the body cells are not in direct contact with the surrounding environment . Thus , every cell of the body will not get oxygen as by the process of diffusion from the environment .

Therefore diffusion is insufficient to meet

the oxygen requirements of multicellular

organisms .