Answer:
The early humans demonstrated artistic expression by painting on cave walls, and by there religious acts of worshipping Mother Nature.
Step-by-step explanation:
They worshipped the sky, grass, animals, and the bodies of water. To celebrate these things they would have religious celebrations. At the celebrations they would sing songs, tell stories, and worship at an alter. They also celebrated by painting pictures of this on cave walls, showing the great power of Mother Nature. And the triumph of a good hunt.
Hope this helps! ; )