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Question

Placoid scales are unique to

A
Teleosts
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B
Elasmobranchs
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C
Birds
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D
Armadillo
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Solution

The correct option is B Elasmobranchs
Placoid scales (dermal denticles) are tough scales, that cover the skin of elasmobranchs (sharks and rays). The function of these scales is for protection against predators, although in some sharks, they may also have a hydrodynamic function.

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