Which of the following is a major difference between the chondrichthyans and the ray-finned fishes?
A) Only chondrichthyans have a lung or swim bladder.
B) Chondrichthyans have a cartilaginous skeleton, whereas ray-finned fishes have a bony skeleton.
C) Only ray-finned fishes have paired fins.
D) Only chondrichthyans have an operculum over their gills.
E) Only chondrichthyans have true jaws.
Correct Answer:
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