The role of populations is great, since almost all mutations occur inside it. These mutations are primarily associated with the isolation of populations and the gene pool, which differs due to their isolation from each other. The material for evolution is mutational variability, which begins in a population and ends with the formation of a species.
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.