Human activity is a powerful factor in the biological regression of species that are necessary and useful to him. For example, microbes resistant to the action of drugs, and insects resistant to pesticides, etc. appeared. When sowing, a person invades wildlife, destroys wild populations over large areas, replacing them with a few artificial ones. The intensified extermination by man of many species leads to biological regression, which threatens them with extinction.
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.