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Life Processes

Question
CBSEENSC10011707

Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like humans?

Solution
In multicellular organisms like us, all the body cells are not in direct contact with the surrounding environment. Thus, every cell of the body will not get oxygen as per need by the process of diffusion from the environment. So, complex multicellular organisms need a specialised tissues, organs and organ system to take in oxygen.