Cartilaginous fish differ from other fish because they have skeletons made of cartilage
Examples of cartilaginous fish include sharks, rays, and chimeras
A sharks eye is special because some can protect their eye with a tough 3rd eyelid, and some even have a muscle that can roll their eye backward for protection.
Differences between bony and cartilaginous fish:
Sharks have fewer and larger blood cells
Shark skin is covered by dermal denticles and bony fish are covered in flat scales
Shark kidneys and genitals empty in only one opening while bony fish have two separate openings, the rectum and the anus.
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