In 1950, the National Security Council, in document NSC-68,

a. urged cooperation between the United States and the Soviet Union.
b. rejected the Truman Doctrine.
c. considered good faith negotiations with the Soviet Union useless.
d. called for unilateral disarmament by the United States.

1) union forces launched a surprise attack.

2) more confederate troops arrived by train.

3) union forces retreated.

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.