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Most of it is cartilage.
bone
Cartilage.
cartilage .
Most of ab baby's bones are made up of cartilage that eventually hardens into bone
It has the main part's of a adult skeleton, but a few bones are missing becuase the baby doesn't need them yet. Also the cranium of the baby's skull made of cartilage.
cartilage
They are mostly made out of cartilage. As the child ages, more and more of the cartilage ossifies (turns to bone). This process is essentially complete by age 21 or so.
Skeleton made up of spicule supports most sponges .
Cartilagecartlidge or boneSharks have a skeleton made of Cartlige.A sharks skeleton is made of cartilage.cartilageShark skeletons are made of cartilage. Like our noses and ears.
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seahorse's skeleton is made up of bony plates