1870-1900 is called the Gilded Age because: O a large number of gold and silver strikes occurred during this period.
while industry boomed, the era was characterized by an increased gap between the rich and poor and political
corruption
unions became powerful throughout the U. S., leading to an increase in wealth.
people gained more wealth per family during this era than in any other period of U. S. history.

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.

b. florence

d. milan