How did a surplus of food lead to the first civilizations?

The use of irrigation enabled early people to farm more land and to farm in drier conditions. As a result, farmers could plant more crops and produce more food. With irrigation, some farmers began to produce a surplus, or excess, of food. With surplus food, villages could support larger populations

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explanation:

genetics is the study of how dna works, the methodologies defining the new recent technologies allow scientist to have a panoramic view of the entire dna landscape, especially how genomes interact with their environment, including off course, factors outside their organisms.

thus is very possible the existence of both scenarios, where populations of isolated individuals have different genetic traits, and share traits related to genetic mutation, due rats can easily travel overseas using human transport channels. so scientists could get a vast number of data, including human interaction, evolution of rodents, health development, spread of infections, development of new organisms, how genomes evolve in different environments and so on.