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

question 18

Multiple Choice

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

• A)Sharks have a strong cartilaginous skeleton that helps them maintain a tubular shape,while skates and rays lack such a skeleton.
• B)Sharks are more closely related to the tubelike lampreys than skates and rays are.
• C)Skates and rays need enlarged pectoral fins to help them stay level in turbulent water,while sharks do not.
• D)Skates and rays exchange gases across their skin and thus require a high surface-area-to-volume ratio,while sharks use gills to respire.
• E)Sharks are streamlined for active hunting,while skates and rays wait on the ocean bed to ambush prey.

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