Why did people believe relocating and isolating
Japanese-Americans was justified?

because of what japan did to pearl harbor, for a long time we didn’t even trust the immigrants, we took them with force out of their house into camps, (not concetration camps) but there were a lot of laws made from that to hav them freed, the government also forced them to work in factories.

Explanation:

what are the choices?

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.