Why is diffusion not able to meet all the requirments in a multi cellular organism?
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Diffusion is not able to meet all the requirements in multicellular organisms because they are not in direct contact woth the surrounding environment.
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Multi-cellular organisms like human have complex body design. They have specific cells and tissues to accomplish different tasks like intake of food and oxygen.Cells in multi cellular organisms is large and thick that diffusion cannot provide sufficient oxygen. Also, humans are apart from the natural environment that simple diffusion cannot provide sufficient oxygen.
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