whyvis diffusion to meet the oxygen requirements of multicellular like us
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Diffusion of Oxygen
The partial pressure of oxygen is low in the alveoli compared to the external environment. This is due to continuous diffusion of oxygen across the alveolar membrane and the diluting effect of carbon dioxide entering the alveoli to leave the body
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As the Unicellular organisms body is in direct contact with the environment they can access through simple diffusion but the multicellular organisms is not in direct contact with environment .......
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