1) the reasons for the change of biogeocenoses: climate change, human activities, natural disasters, as well as changes in the habitat of the species living in them;
2) crowding out older species with more competitive species;
3) an increase in species diversity, food chains, the formation of a closed cycle of substances – the causes of the emergence of a more stable 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.