Multicellular organisms need exchange surfaces because their low surface area to volume ratio limits the diffusion of substances from the outer surface to meet the needs of the entire organism.
Multicellular organisms require exchange surfaces because their small surface area to volume ratio means diffusion across the outer surface is insufficient to supply the entire volume.
| Front | Why are exchange surfaces needed for multicellular organisms? |
|---|---|
| Back | They have a small surface area to volume ratio - not enough substances can diffuse from their outside surface to supply their entire volume. Therefore the need of exchange surfaces for effecient diffusion. |
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