they have skeletons made of cartilage
2. List examples of cartilaginous fish from other fish?
Skeleton, eyelid, heart and blood, external, features, buoyancy, digestion and evacuation osmoregulation, life history, reproduction, diversity patterns
3. What's special about a sharks eye?
Sharks have a third eyelid called mic rating membrane.
4. What are the difference between bony fish and cartilaginous fish?
A. Heart and blood
Bony fishes 4th compartment of the heart is made of non-contractile smooth muscle and elastic fibers.
B. external feature
Bony fishes have an internal organ know as the swim bladder that keeps them active natural buoyancy by exchanging gasses with blood vessels.
C. Digestion and evacuation
Bony fishes have two separate openings a rectum and a mouth.
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