Explain what rusesabagina has trouble unstanding in lines 4-25

Working as a concierge at Hotel des Mille Collins In Kigali, hid and protected 1,268 Hutu and Tutsi refugees from the militia during the Rwandan Genocide.None of those refuges were hurt or killed during the attacks.

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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.