Which statement is true?
A) Sharks have a skeleton made of bone, while ray-finned fishes have flexible skeletons made of cartilage.
B) Ray-finned fishes have a skeleton made of bone, while sharks have flexible skeletons made of cartilage.
C) Sharks have a series of rod-shaped bones in their muscular pectoral and pelvic fins, while lobe-fins have flexible skeletons made of cartilage.
Answer: B
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