no specific organic is needed for the exchange of gases in unicellular organisms why ?
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No specific organ is needed for the exchange of gases in unicellular organisms because they have very simple body system by which they undergo simple diffusion method for exchange of gases.
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Answer:
because the body of unicellular organism is a single cell and their full body is in contact with the environment so they can exchange gases by a simple process of diffusion. but in complex organisms like human beings all the cells of the body are not in contact with the environment therefore complex organs are required for gaseous exchange
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