Question

why is diffusion insufficient to meet the oxygen requirements of multicellular organism like human ?​

Answer 1

Answer:

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Explanation:

As in multicellular organisms, all the cells are not in direct contact with environment, simple diffusion does not meet the requirement of all the body cells to get sufficient oxygen.

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Answer 2

Answer:

As in multicellular organisms, all the cells are not in direct contact with environment, simple diffusion does not meet the requirement of all the body cells to get sufficient oxygen.

                                                     OR

Since diffusion is a very slow process and it will require very large amount of time for oxygen to reach each and every part of the body. That is why diffusion is insufficient to meet the energy requirements of multicellular organisms like humans .