Answer:
The Late Middle Ages marked the end of the Middle Ages and ushered in the modern era in Europe. The Late Middle Ages took place between the 14th century and the early 15th century. The notable event of the Late Middle Ages was the decline of the Byzantine Empire and the Fall of Constantinople in 1453, which led to the rise of the Ottoman Empire.
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Well, at the 52 B.C. Roman conquering of the Paris basin, it was already an important crossroads between river and road travel (a place where a major north-south route crossed the Seine river across its central island), but it is not certain that the area was the major habitation then (the nearest known major Celtic population centre was in today's Sens). Anyway, the Romans took an interest Paris' island it for its strategic position for a garrison and lightly fortified it, but when it later become a trading centre, Gallo-Roman growth spread to the Left Bank.
C. Discovering vaccination and microbial fermentation
A microbiologist who discovered microorganisms cause fermentation. Eg. leading to food spoilage
A secondary source could be someone that maybe discovered the body or is doing evaluations to see why or how he died, like a doctor for instance it would be a secondary source because............the doctor was not there and he did not watch so....and if he wrote about it then that would be a secondary source! :) <3 hope this helps!
Military takes over people called martial law, seized property, controlled transportation and communication.