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How did the dawn of Paleolithic people surpass1000 people?

1. First of all, the Paleolithic population was overpopulated, and the population of Paleolithic settlements reached 100.

2. The second is fertility, through which ancient humans can acquire new populations.

3. Finally, immigration, where people from other places immigrate, can increase the population. Both fertility rate and migration rate are affected by satisfaction. The higher the satisfaction, the higher the birth rate and the number of floating population.