The document summarizes the three main stages of the primitive era: Paleolithic, Mesolithic, and Neolithic.
1) The Paleolithic age from 2.6 million to 10,000 years ago was characterized by early humans living as hunter-gatherers using basic stone tools. Cave paintings indicated a developing religious practice.
2) During the Mesolithic from 10,000 to 6,000 years ago, humans adapted to environmental changes by developing fishing, domesticating animals, and living in settlements.
3) The Neolithic revolution began around 9500 BC with the adoption of agriculture, development of pottery, and construction of permanent mud brick houses, marking a shift to settled life.