Q.

Skin is covered with cycloid / ctenoid scales. This feature belongs to the members of

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a

Chondrichthyes

b

Osteichthyes

c

Cyclostomes

d

Amphibians

answer is B.

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Detailed Solution

In Osteichthyes, the skin is covered with cycloid / ctenoid scales.In Chondrichthyes, the skin is covered with placoid scales.Cyclostomes and most of the amphibians are without exoskeleton.
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