Why did germany want lenin to return to russia in 1917?

Explanation:

Lenin had been exiled from Russia and was in Germany.  But The German government helped him return to Russia.  Revolutionary activity broke out in Russia in February, 1917 -- during the time of World War I.   Germany and Russia were on opposite sides in that war, and the German authorities hoped that the return of Lenin to Russia would help foment further revolution there and hurt the Russian government's ability to wage war in Europe.  They were correct in that assumption.  The major revolution in Russia, known as the Bolshevik Revolution, occurred in the fall of 1917.  In March 1918, the new Soviet government, led by Lenin, ended its participation in the war against Germany, signing the Treaty of Brest-Litovsk.

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.