This is not a real life in heaven. Although there were simple stone tools at that time, the food source was still unstable. Generally speaking, it was limited by the productive labor force at that time. Neanderthals can only survive and develop in the primitive ecological environment if they live in groups and help each other.

2. A very important feature of this period is the development of productive forces. In addition to men hunting and women picking fruits, an important food (rice) has appeared in our human diet. Stone tools are more exquisite than those in the caveman period, which also improves people's labor efficiency. Only with better food security can we settle down. The fundamental reason is the development of productive labor!

Walking out of the cave means that human beings have developed from relying on nature to changing nature and can arrange their activities more freely. The larger the scope, the wider the food source, which is also the result of the development of productive labor force making human beings the master of all things.