Question

Why did the people living in the caves paint the wall ?​

Answer 1

Answer:

Prehistoric man could have used the painting of animals on the walls of caves to document their hunting expeditions. Prehistoric people would have used natural objects to paint the walls of the caves. To etch into the rock, they could have used sharp tools or a spear.

Answer 2

The earliest people hunted, gathered plant produce, made stone tools, and painted on cave walls. Some of them lived in the open air sites while some of them took shelter in the caves. In these caves we find the remains of their life in the forms of paintings on the cave walls they left behind.
Or

Early humans may have used art as a way of helping themselves in their struggle for survival. Paintings of animals on cave walls are common. Perhaps this was thought to bring success when hunting or acted as a call for help from a spirit world the people believed in.