Question

why is diffusion insufficent to meet the requirements of multicullular​

Answer 1

Explanation:

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Answer 2

Answer:

$\huge\bf\pink{Answer}$

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. Diffusion is too slow to cover the distance between the gas exchange surface and the sites where the oxygen is required.