Give two reasons why multicellular organisms need special special organs for exchange of gases
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We know that unicellular ( organism made of one cell ) organism have their whole body in contact of environment. So, they do not need special organ for exchange of gases. But, multicellular organisms do not have their full body in contact of environment and it is also known that diffusion will take 3 years to go to our feet from alveoli through diffusion. So, special organs are required for exchange of gases.
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