Which one of the following is absent in shark?

Claspers

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Placoid scales

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Cartilaginous endoskeleton

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Air bladder

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Solution

The correct option is D Air bladder
Sharks are cartilaginous fishes that do not have air bladders and hence have to swim continuously or else they may sink.
They have placoid scales, cartilaginous endoskeleton, Male sharks have claspers that help in mating during sexual reproduction.

Thus, the correct answer is option D.

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