Teeth of cartilagenous fishes are modified

Ganoid scales

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Cycloid scales

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Cosmoid scales

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Placoid scales

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Solution

The correct option is D
Placoid scales

Cartilaginous fishes like shark, have placoid scales which are bony, spiny projections with an enamel-like covering. It is also thought that true teeth in these fishes developed from placoid scales.

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Teeth of cartilagenous fishes are modified

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