Why do skates and rays have flattened bodies, while sharks are torpedo shaped?a. Sharks are more closely related to the tube-like lampreys than are skates and rays. 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 at mid-depths, while skates move about mostly on the ocean bed.

D.Sharks are streamlined for active swimming at mid-depths, while skates move about mostly on the ocean bed.

Explanation:

Sharks are known to be active off the bottom of oceans and in mid depth which has a high salinity and the streamlined body helps it to move in this kind of saline conditions.

The Skates however don’t move much and are always at the ocean bed.

This is why Sharks are streamlined for active swimming off the bottom, while skates have flat bodies move about mostly on the ocean bed is the right choice.

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