What had damaged Ancient Rome? I'm really stuck on this, could you help me-

In 455 the city suffered a much more destructive attack by the Vandals, raiding from their kingdom in Tunisia. A century later Rome suffered extensive damage when it was caught in the middle of 20-year struggle between the Ostrogoths and the Byzantine Empire, when it changed hands several times and was briefly empty of any inhabitants. I think that is it correct me if I'm wrong.

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.

where is the