The vital activity of all organisms that enter the biosphere is associated with the extraction of a significant amount of mineral substances from the environment. So, after the death of organisms, all trace elements and substances return to the environment again. Therefore, there is a cycle that has a cyclical nature. This energy turnover involves all living organisms that make up the biosphere. In this case, metabolism is the driving factor, if you exclude it, then the existence of the biosphere itself will be impossible.
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.