why exchange of gas or removel of waste occurs in single celled organism but lack multicellular organisms?
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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 organisms.
khushi123485:
one more reason is that all the cells of any multicellular organism are not in direct contact with environment therefore diffusion doesn't take place in multicellular organisms
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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 organisms......
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