What is a major reason the Renaissance began in the Italian city-states?

The Renaissance began in the Italian city-states because they had the wealth from the commerce and trade of the Middle Ages. For some time, Venice had outfitted the crusaders and was the conduit for the silk and spice trade from India and China.

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.

they were citizens but they could not vote and they did could not get involved into a political situation during that time.