How was thomas jefferson able to defend purchasing the louisiana territory from france? a he made the argument that the constitution granted the president the power to make treaties with another nation. b he encouraged congress to pass a law giving the president the power to purchase the territory. c he pointed out that the constitution granted the president the power to purchase lands as needed for the country. d he used the "necessary and proper" clause to make a case that it would be necessary to purchase the territory.

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.