Which helped the ancient people to solve the problem of hunger, increasing the productivity of crops

Which helped the ancient people to solve the problem of hunger, increasing the productivity of crops and the productivity of animals.

Ancient people were very dependent on the weather, harvest and other factors. The problem was that although people were few compared to our time, and there were enough fields, any attack by insects or lack of rainfall could starve a huge number of the population. People started breeding, selecting the strongest plants and the strongest animals. Artificial selection has helped improve yields and some properties of many animals. In our time, genetic engineering has practically supplanted selection.