Cartilage is stiffer and less flexible than muscle, and is not as hard or rigid as bones. It does not heal.
Sci name:
Chondrichthyes
Common name: cartilaginous fishes.
Sharks are one example of cartilaginous fishes.
They do not have ribs; thus, if they went outside water their own body weight would crush them.
Thick skin.
Teeth evolved from sharp bony plates around their head, differently from other teeth:
No parental care after birth.
One example is the basking shark:
Another is the megalodon:
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