calcium
No insect have bones. They have a hard outer covering, but no bones.
its bones
Periosteum
bones and internal organs.
Flat bones
The bones covering the brain are called the cranium as a group. There are eight bones in this group.
It is covered in cartilage
cranium
Periosteum
Periosteum is the membrane that lines the outer surface of all bones, except at the joints of long bones.
Fur on the body and a skin between the bones of the wings.