Why Do Skates and Rays Have Flattened Bodies,while Sharks Are

question 55

Multiple Choice

Why do skates and rays have flattened bodies,while sharks are torpedo shaped?

• A)Sharks are more closely related to the tubelike lampreys than skates and rays are.
• B)Skates and rays need enlarged pectoral fins to help them stay level in turbulent water, while sharks do not.
• C)Skates and rays exchange gases across their skin and thus require a high surface-area-to-volume ratio, while sharks use gills to respire.
• D)Sharks are streamlined for active swimming off the bottom, while skates move about mostly on the ocean bed.

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