Natural and artificial selection is based on hereditary variability. As a result of natural and artificial selection, new forms of living things arise: species, plant varieties and animal breeds. In natural selection, the criterion is the usefulness of a new trait for the species, for the life of its individuals under certain conditions. Thus, natural selection works for the benefit of the species.
With artificial selection, the criterion is the usefulness of a new trait for a person, and this trait may even be harmful to the body. Therefore, most breeds and varieties artificially obtained by man cannot survive in natural conditions and their existence is supported by man. Natural selection takes place on Earth from the moment the first living creature appears on it. Artificial selection arose quite recently, when man began to breed domestic animals and engage in agriculture.
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.