Cartilage is living tissue that looks and feels a bit rubbery.
Bones start off as cartilage in the womb.
As you grow the cartilage is replaced by bone.
Ossification is the depositing of calcium and phosphorous in the cartilage which changed it to bone.
To tell if someone if still growing you can look at how much cartilage is present in the body. The more there is the more a person still has to grow.
When you're fully grown there will still be cartilage at the ends of bones.
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