Read this excerpt from Franklin D. Roosevelt’s “Four Freedoms” speech. Which part shows his purpose in making the speech to Congress? During sixteen long months this assault has blotted out the whole pattern of democratic life in an appalling number of independent nations, great and small. The assailants are still on the march, threatening other nations, great and small.

Therefore, as your President, performing my constitutional duty to "give to the Congress information of the state of the Union," I find it, unhappily, necessary to report that the future and the safety of our country and of our democracy are overwhelmingly involved in events far beyond our borders.

Armed defense of democratic existence is now being gallantly waged in four continents. If that defense fails, all the population and all the resources of Europe, Asia, Africa and Australasia will be dominated by the conquerors. Let us remember that the total of those populations and their resources in those four continents greatly exceeds the sum total of the population and the resources of the whole of the Western Hemisphere—many times over.

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.

dylan has written many enduring songs and he has received several awards for his musical achievement;  

any written work with artistic value can be considered literature; especially if such work is publicly recognized, and has had importance and endurance among people; whether is poetry or fiction or drama or even criticism, since it's the transcendence and representation of a culture, language or people in a period of time to more people, using letters (words), regardless the subject.

the nobel prize in literature is given to authors from any country based on a body of work as a whole that inspires and nurses the life of humanity.  

and the work of bob dylan matches that description, therefore is well deserved since he'd created new poetic expressions within the american song tradition, that has inspired and influenced the lives of many people, not only withing the united stated but worldwide as well.