The European plague of the 1300s was called the O great pandemic.
O black death.
O great epidemic.
O black pandemic

The Black Death

Explanation:

It goes by many names such as: The Black Plague, The Black Death, and The Bubonic Plague.

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.

is this like a kind of true or false question?