Final answer:
Prehistoric hunter-gatherer groups commonly had a nomadic lifestyle, a sexual division of labor with distinct roles for men and women, and a pronounced egalitarian social structure with shared resources and valued generosity.
Step-by-step explanation:
Prehistoric hunter-gatherer groups had several common characteristics, despite the diversity in their lifestyle across different regions. One core commonality was their nomadic lifestyle, driven by the need to find food, which led them to live in small groups and move seasonally across territories. This mobility was a central aspect of their existence. Another feature was the sexual division of labor, typically with men focusing on hunting and women on gathering, though both roles were crucial for the group's survival. Lastly, these societies often embodied a strong tendency toward egalitarianism, characterized by a lack of material possessions, shared resources, praised generosity, and the discouragement of self-aggrandizement.