Cartilaginous fishes do not have

Operculum

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Scales

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Gill slits

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Air bladder

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Solution

The correct option is D
Air bladder

Cartilagenous fishes possess separate gill slits, without a gill cover or operculum. Their skin contains placoid scales. Due to the absence of air bladder,
they have to swim constantly to avoid sinking. Bony fishes on the other hand, possess gill covers and an air bladder.

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Cartilaginous fishes do not have

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