For many millennia, man has lived in a natural habitat, without seriously affecting the processes occurring in the biosphere. With the development of civilization, the relationship between man and nature has changed significantly. Man increasingly used natural resources, destroyed existing ecosystems and created artificial ecosystems (man-made).
The most common artificial ecosystems are agrobiocenoses. They occupy about 10% of the entire land surface, are created for agricultural products and are regularly maintained by humans.
In agrobiocenosis (for example, fields, gardens, orchards, pastures), the same food chains are formed as in the natural ecosystem: producers (cultivated plants, weeds), consumers (insects, birds, rodents, predators) and reducers (bacteria and fungi) . Man is an indispensable link in this food chain. It creates the conditions for high productivity of agrocenosis, and then uses the crop.
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.