Historians believe that florence, italy, was the birth-place of the renaissance because florence a) was home to many people from china and japan. b) remained loyal to the pope during the reformation. c) avoided being affected by the plagues that struck europe. d) was a wealthy center of trade in the late medieval period.

the answer here would be

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.

the answer is prolly b