Title says all, what is the land mammal, fish, made out of?
[spoiler]succ ( ͡° ͜ʖ ͡°)[/spoiler]
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The skeleton of the fish is either made of cartilage (cartilaginous fishes) or bones (bony fishes). The main features of the fish, the fins, are bony fin rays and, except the caudal fin, have no direct connection with the spine.