The cartilaginous fishes are believed to have evolved from ancestors having well-developed bone.
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Q6: The ray-finned fishes belong to the class
Q7: Sharks are heavier than water but achieve
Q8: Most fishes are dioecious,with external fertilization and
Q9: One lineage of the neopterygian fishes gave
Q10: Hagfishes locate their food through keen vision.
Q12: The hagfishes are marine scavengers.
Q13: The chondrosteans are one group of the
Q14: All bony fishes have a pneumatic duct
Q15: The ray-finned fishes are the most numerous
Q16: The earliest fishlike vertebrates were a paraphyletic
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