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Life Processes — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceLife Processes1 Mark
Question
Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like humans?
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Answer

As in multicellular organisms, all the cells are not in direct contact with environment, simple diffusion does not meet the requirement of all the body cells to get sufficient oxygen.

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