Why is diffusion is insufficient to meet the oxygen?
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The oxygen requirements of an animal cannot be met by the process of diffusion as diffusion is a very slow process. ... This helps for the higher animals like humans to meet the sufficient oxygen requirement. Unlike unicellular organisms, multicellular cells are not in direct contact with the outside environment.
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Explanation:
In multicellular organisms , all the cells may not be in the direct contact with the surrounding environment. Therefore,the diffusion is insufficient to meet the oxygen requirements in them . Instead, they need specialized organs for breathing and exchange of gases.
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