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large organisms need larger area to exchange more substances.but large organisms have small surface area to volume ratio.this means that the surface is not large enough to enable gases and nutrients at the fast rate needed to keep all the cells alive.thus large organisms need special exchange surfaces to provide the body with the nutrients and gaseous exchange they require.

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15y ago
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11y ago

They need a large surface for exchange as simply diffusion will not be fast enough to provide all the cells with right amount of gas and nutrients, also simple diffusion may not reach all the cells.

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Q: Explain why large active organisms need special surface for exchange?
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