What is the primary skeletal difference between the Class Chondrichthyes and the Class Osteichthyes?
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Correct answer: Chondrichthyes have a cartilaginous skeleton, while Osteichthyes have a bony one
Chondrichthyes (sharks, rays, skates) possess an endoskeleton composed entirely of cartilage, which may be calcified but never ossifies into true bone. Osteichthyes (bony fish) possess a skeleton primarily made of ossified bone, which is denser and can be remodeled throughout life.
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More Chordata: Protochordata to Amphibia questions
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