Yes, but this is not the major source. Marine corals are the most abundant source.
They are like little fish fosils for an example if you find a limestone rock look at it and you will see bones
a sharks "skeleton" is made of cartilage.
yes, your skeleton system is made of bones.
A monster made from bones is a skeleton.
Bones
There's 206 bones in the human skeleton.
No, the human skeleton is made up of 206 bones.
Insects don't have bones. Insects have an exo-skeleton instead, a hard outer layer that protects and gives them shape. The exo-skeleton is made out of Chitin.
Yes, they have a skeleton made of bones, just like other reptiles.
A grasshopper's skeleton is external and is called an exoskeleton. It is made of a substance called chitin and does not contain bones. A human's skeleton is internal and in an adult contains 206 bones.
Bones
Skeleton