Populations of different species in nature are in constant interaction – they compete for space for life, form living conditions and serve as food for arcs for a friend. As a result of evolution, under conditions of coexistence on Earth, complex and strictly organized complexes of interacting populations — biological communities — were formed. They are systems of a higher than the population level of the supraorganic organization of life.
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.