Dubrava is a perfect and sustainable ecological system that can exist for centuries under constant external conditions. The biogeocenosis of oak groves comprises more than a hundred species of plants and several thousand species of animals. It is clear that with such a diversity of species that inhabit oak forests, it will be difficult to shake the stability of a given biogeocenosis by destroying one or more species of plants or animals. It is difficult, because as a result of the long coexistence of plant and animal species from separate species, they became a single and perfect biogeocenosis.
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.