why diffusion pressure is not sufficient in large animals
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A large animals have a large number of cell . as the animal gets larger, it has most of his cell not exposed to the environment . it therefor needs more means of oxygen supply since oxygen cannot its cell through diffusion pressure in the environment . this is only made possible by the circulation system in large organisms
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They have specialised cells and tissues for performing various necessary functions of the body such as intake of food and oxygen.Unlike unicellular and multicellular organisms are not in the direct in contact with the outside environment.Therefore, diffusion cannot meet their oxygen requirements
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