Question

why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like humans. in points​

Answer 1

Answer:

human are multicellular and they have specialised tissue for each and every functions of the body. for these many functions the energy requirement in our body is more. by simple diffusion our energy requirements are not fulfilled and this is the reason why diffusion don't work. therefore there is a requirement of specialised cells for this work these specialised cells leads to the evolvement of our respiratory system which is capable of producing sufficient energy for our body.....

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Answer 2

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Multi-cellular organism’s like humans have very big body and require a lot of oxygen to diffuse into body quickly in order to meet the oxygen requirement. Diffusion is a slow process which will take a lot of time to circulate oxygen to all the body cells. Because of its slow nature diffusion is insufficient to meet the oxygen requirements of multicellular organisms like humans.