To study depression, Avshalom Caspi and colleagues followed a group of nearly 1,000 people from age 3 until age 26. The investigators measured life events experienced by the participants at different ages. What were the findings

The correct answer is a. when they started making tools that will them in cultivating lands, they could raise crops and that made them attached to one place for a longer period of time. after that, they started domesticating animals and building their own permanent settlements that resemble the ones we have today.