character: Rays
topic: The Evolutionary History of Rays
grade: 9
subject: Biology
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character: Cartilaginous Fish
topic: Anatomy and Evolution of Cartilaginous Fish
grade: 9
subject: Biology
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character: Chondrichthyans
topic: Chondrichthyan Diversity and Evolution
grade: 9
subject: Biology
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character: Elasmobranchs
topic: Origins and Evolution of Elasmobranchs
grade: 9
subject: Biology
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