Name a flat bone?

_______are arranged  in the form of concentric rings.

The external surface of the bone is covered by a membrane  called __________.

The lumbar spine  has _________ vertebrae.

The back part of the cranium contains  a large hole called the  __________.

An example  of short bone.

A bone put  in weak hydrochloric acid is called  decalcified bone because ___________.

Bones are hollow  filled with ___________.

The neck region has seven ____________ vertebrae.

The  _________bone is highly calcified,  hard and  rigid  connective tissue.