How did Pax Romana impact the population during the 200 year period? Cultural similarities, stability, and consistent freedoms for all the population.
Economic growth, Greek language, and increasing numbers of freedoms for the people.
Growth in arts and trade, economic stability, but political turmoil.
Stability in the economy, increasing freedoms for the population.

Stability in the economy, increasing freedoms for the population

Explanation:

During Pax Romana, a period of relative peace and thriving era experienced by the Roman Empire that began when Augustus in 28 BC declared the end of civil wars. This era saw unprecedented peace and economic prosperity throughout the Empire,many jobs were created for the unemployed, even plebeians  and former slaves were given right to participant in the affair of the empire. This period of peace lasted until the year of the death of the emperor Marcus Aurelius, in 180 AD and reached its peak in terms of population, with its population swelled to an estimated 70 million people.

During the Pax Romana, everyone spoke and wrote in Latin or Greek which is also one of the language used by the Romans;Trade, manufacturing, and the arts flourished. different cultures was blended together which enable peaceful co existence.

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.