The skleletal system
in human body they are hard supporting structures called bones
the muscles
The human skeleton.
Skeletal sysytem
Yes it does. It contains calcium that supports the growth of bones and teeth. Yes it does. It contains calcium that supports the growth of bones and teeth.
Basically they're all the same except for the shape of the bones.
The human body is made up of many different types of structures. In your leg alone there are four bones.
The skin protects the bones and the bones protect the organs in the body.
Homologous add Perhaps to a human's foot.
If you mean "light" as in "the opposite of being heavy", then: Bird bones are hollow. Well, not completely, but if you look at the structures they are not as "filled up" as, say, human bones.
The human skull is a group of bones that looks like a large egg with odd shaped facial bones in the front that are the basis of the muscular and cartilage structures of the face.
The foundation of the human body is the bone structure which holds all other structures of the body.