Scientists believes that earth was formed approximately about ___________ years ago.

Primitive man lived in ___________.

During Paleolithic age man was

__________ is known as prehistoric age.

Primitive man produced his food through ___________

Core tools used for ___________.

__________ were used for skinning animals and chopping meat.

Stone age is divided into _________ types.

Middle stone age is also known as __________.

___________ were pear-shaped.