Why couldn’t primitive man live alone?

Because life in primitive times was very harsh, and therefore, a person alone could not survive, as there were a lot of dangers in wait for him, starting with predators and ending with hunger. Because even getting food was sometimes a very difficult task, especially in the cold season, then the main source of food was hunting, and it was better to hunt in a group, since the chance of a successful outcome was much higher.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.