Why was the work of andreas vesalius so important to medicine a his development of a more powerful miscroscope allowed scientists to see micro organisms first time. b his studies of human circulatory system correctly identified the heart as a pump that pushed blood through out the body . c his work with ointments to prevent infection l

do but i don't go there

explanation:

btw this is in middle school stuff lol

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.