Which of the following has a cartilaginous endoskeleton?

Elasmobranch

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Dipnoi

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Mollusca

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Bony fishes

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Solution

The correct option is A Elasmobranch
Elasmobranch has well-developed endoskeleton made up of cartilage. Dipnoi is primitive lungfishes in which the swim bladder of other fishes works as lungs. They have primitive bone-cartilage endoskeleton. Mollusca has an exoskeleton. Bony fishes have an endoskeleton made of bone. Thus, the correct answer is option A.

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