What are the three events that occurred between 1857 in 1859 facilitated southern secession

The Abraham Lincoln-Stephen Douglas debates .

The Dred Scott decision by the Supreme Court .

Raid on Harper's Ferry by abolitionist John Brown .

i think it would be reparing roads  

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.