Answer: Because they were at a lower level of intellectual development in the previous period, the Paleolithic.
Step-by-step explanation:
Humans domesticated the first plant and animal species during the Neolithic. The dog, wheat, and pig are the first species that humans have domesticated. In this way, the lifestyle completely changed. People no longer lived a nomadic lifestyle, tied to one area and formed the first social communities. So in the Neolithic, the human race began to develop more intensively.