What were ancient Egypt's economics?

Ancient Egypt was located on the Nile River and had some of the most fertile land in the ancient world. Ancient Egyptians grew many crops, and because coins and paper money had not yet been invented, their economy depended on using their goods, mostly crops including grain, in a bartering system.

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.