Why was the Lewis & Clark Expedition important? A) It built the Transcontinental Railroad

B) It gave a better understanding of the Louisiana Territory

C) The United States gained parts of Mexico

D) Took land away from the British

I believe it's B) it gave a better understanding of louisiana territory

Explanation:

they sent a team to explore lands aquired in the louisiana territories

(not completely sure maybe do some more research based of my answer)

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.