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Multiple Choice point Why do skates and rays have flattened bodies, while sharks are torpedo shaped? ~) Skates and rays exchange gases across their skin and thus require a high surface-area-to-volume ratio; sharks use gills to respire. Sharks have a strong cartilaginous skeleton that helps them maintain a tubular shape, whereas skates and rays lack such a skeleton. Sharks are more closely related to the tubelike lampreys than skates and rays are. Sharks are streamlined for active swimming off the bottom; skates move about mostly on the ocean bed