Lesson: Chapter 13 — The Living World
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On what basis are fishes separated into Chondrichthyes and Osteichthyes?
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How the internal skeleton is made. Chondrichthyes are cartilaginous; Osteichthyes are bony.
Sharks and rays are the cartilaginous fishes — about 10% of all fishes. The remaining 90% are bony.
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