In single celled organisms diffusion is sufficient to meet all their requirements of food exchange of games or removal of wastes but it is not in case of multicellular organisms. Explain the reason for their difference
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Diffusion is a very slow process. If multicellular organisms used diffusion to meet all requirements of food, exchange of gases or removal of wastes it would take too much of time for carrying even a single particle in the body of the organism and hence diffusion is a process only for unicellular organism
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HEYMATE!!!!
■ In multi - cellular organisms, all the cells may not be in direct contact with the surrounding environment.
■thus,simple diffusion will not meet the requirements of all the cells.
■In case of a single - celled organism, no specific organs for taking in food, exchange of gases or removal of wastes may be needed because the entire surface of the organism is in contact with the surrounding environment.
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