Charles Darwin is called natural selection the preservation of favorable individual differences and the modification and elimination of harmful ones. Developing the doctrine of natural selection, he draws attention to such of its characteristic features as the gradualness and slowness of the process of change and the ability to summarize these changes into large, decisive ones, which ultimately lead to the formation of new 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.