Complete the sentences:
(a) Hunter-gatherers chose to live in caves and rock shelters because _____________.
(b) Grasslands developed around _______________ years ago.
(c) Early people painted on the ________________ of caves.
(d) In Hunsgi, tools were made of ______________.
(a) Hunter-gatherers chose to live in caves and rock shelters because they provided shelter from rain, heat and wind.
(b) Grasslands developed around 12,000 years ago.
(c) Early people painted on the walls of caves.
(d) In Hunsgi, tools were made of stone.