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Explain how fish gills have such a high surface area. Fish gills contain highly flattened
structures that increase the surface area, heiping gases and nutrients move across them. The
surfaces of the gills are highly folded, making an extensive surface for gas exchange. Fish gills
consist of a highly branched network of tubelike structures. This increases the surface area for
gas exchange. The gills are highly perforated to allow for easy flow through while the fish is
swimming.

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