Sharks and Dog fishes differ from skates and rays because

Gill slits are ventrally placed

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head and trunk are widened considerably

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Distinct demarcation between body and tail

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their pectoral fins distinctly marked off from cylindrical bodies.

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Solution

The correct option is D their pectoral fins distinctly marked off from cylindrical bodies.
Sharks and dogfishes are known to have cylindrical bodies with pectoral fins making clear distinctions from the body. But skates and rays have flattened bodies with winglike pectoral fins which are not distinct from the body.
Correct answer-D. their pectoral fins distinctly marked off from cylindrical bodies.

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________ is the class of fishes in which fins are supported with bony or horny spines which are directly attached to the body.

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