In single celled organisms diffusion is sufficient to meet all their requirements of food. Explain
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Diffusion is a very slow process. If multicellular organisms useddiffusion 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 inthe body of the organism and hence diffusion is a process only for unicellular organisms.
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Answer: In order to grow they need food.
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