Which among the following is the main difference between Chondrichthytes and Osteichthytes?

Which among the following is the main difference between Chondrichthytes and Osteichthytes? Correct Answer Endoskeleton composition

Pisces are sub-classified into Chondrichthytes and Osteichthytes based on the composition of endoskeleton. In Chondrichthytes or cartilaginous fishes, endoskeleton is made of cartilage. In Osteichthytes, endoskeleton is made of bone.
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