Endoskeleton is cartilaginous in

Elasmobranchii

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Dipnoi

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Mollusca

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Osteichthyes

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Solution

The correct option is A Elasmobranchii
A. Elasmobranchii is the group that includes cartilaginous fishes. The gill pouch of the fishes of this group is homologous to the lungs of frogs.
B. Dipnoi is a subclass that includes lungfishes. These fishes have a bony endoskeleton.
C. Mollusca is the second largest phylum of the animal kingdom and includes predominantly marine species.
D. Osteichthyes is a class of Bony fishes because their endoskeleton is made up of bones.
Hence, endoskeleton is cartilaginous in Elasmobranchii. So, the correct answer is 'Elasmobranchii'.

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