What can happen to the forest in which people exterminated almost all predators?

Predators are the orderlies of the forest. They prey on weak and sick animals. If there are none, then healthy animals will become infected by the sick and die too.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.