Why Do Skates and Rays Have Flattened Bodies, While Sharks

question 14

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, whereas 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, whereas sharks do not.
• D) Skates and rays exchange gases across their skin and thus require a high surface-area-to-volume ratio; sharks use gills to respire.
• E) Sharks are streamlined for active swimming off the bottom; skates move about mostly on the ocean bed.

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