The byzantine empire influenced the development of russia because there were very close trading ties between the two. through contact with the byzantines, the rus adopted many byzantine ways. it was orthodox monks who created the cyrillic alphabet that came to be used for writing russian.

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.

no because we were not ready for war