Human  skeleton  consists of __________ bones.

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

There are  ____________thoracic vertebrae.

_______are arranged  in the form of concentric rings.

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

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

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

The lumbar spine  has _________ vertebrae.

The vertebral or spinal column  is composed of  33  ring like  bones called __________.

Bones are a store house of __________ & __________ .