Cartilaginous fishes do not have

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Question

(A) Cartilaginous fishes (Class $Chondrichthyes$) are characterized by a cartilaginous endoskeleton. $A$ key distinguishing feature of these fishes is

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Operculum

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(A) Cartilaginous fishes (Class $Chondrichthyes$) are characterized by a cartilaginous endoskeleton. $A$ key distinguishing feature of these fishes is the absence of an $operculum$ (gill cover) over their gill slits. Instead,they possess $5-7$ pairs of separate gill slits that open directly to the exterior. While they do possess placoid scales,pelvic fins,and gill slits,the operculum is absent.

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