Which statement about african americans who served in world war i is true?
they numbered about two million men.
they served on the front lines.
they were not required to register for the draft.
they served mostly in noncombat roles.

the selective service was designed to
create more rigorous requirements for men enlisting in the military
raise money for the war effort through the sale of war bonds
institute a draft to increase the number of men in the military
choose women to work in war related businesses.

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.