Which of the following fishes has a skeleton made of cartilage only?

Shark

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Tuna

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Rohu

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All of these

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Solution

The correct option is A Shark

Fishes are scaly-skinned, cold-blooded vertebrates that breathe through gills.
Two types of skeletons are found in fishes, namely, cartilaginous and bony.
Sharks are cartilaginous fishes as their skeleton is entirely made of cartilage.
Rohu and Tuna are bony fishes as their skeleton is made up of bones.
Thus, the correct answer is option A.

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