How could a person not listed in presidential order of succession succeed the presidency?​

John Tyler was the first vice president to assume the office of president at the death of the president. William Henry Harrison died shortly after becoming president and Tyler took over.

U.S. senator before being elected Vice President in 1840. He was the first to succeed to the office of President on the death of the incumbent, succeeding William Henry Harrison.

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.

hi, according to my research the answer to the first question would be false. al tabari was the author of the first medical encyclopedia & he was a persian scholar not arab