Sharks and dog fishes differ from skates and rays by ______________.

Head and trunk are widened considerably

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Distinct demarcation between body and tail

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Their pectoral fins are distinctly marked off from cylindrical body

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Gill slits are ventrally placed

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Solution

The correct option is C Their pectoral fins are distinctly marked off from cylindrical body
C. Their pectoral fins are distinctly marked off from cylindrical body
Reason: Sharks and dogfishes have cylindrical body while skates and rays have both of their pectoral fins fused. It gives a wing-like appearance and are not distinct from body. Head and trunk are widened considerably. Distinct demarcation between body and tail is observed. Gill slits are also ventrally placed. So the correct option is C.

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