Final answer:
Bony fish are characterized by specific structures like scales and swim bladders not typically found in cartilaginous fish.
Explanation:
Among the structures typically found in bony fish but not in cartilaginous fish are 3 scales and the swim bladder. Bony fish have bony skeletons, while cartilaginous fish have primarily cartilaginous skeletons. The presence of these structures can help differentiate between the two fish types.
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