The document summarizes key aspects of Paleolithic civilization from 2 million BCE to around 10,000 BCE. During this era, humans lived in small hunter-gatherer societies and used only stone tools. The Paleolithic is divided into three periods: Lower (tool use began), Middle (tool making improved), and Upper (artistic and cultural developments emerged). Paleolithic humans migrated throughout Africa and Eurasia and adapted to fluctuating climates. They hunted animals and gathered plants for food, and had religious beliefs involving spirituality and burial rituals.