Answer:
Among the advantages we can name the fact that across most Europe there are fertile soils, long river systems, the terrain makes traveling easy and therefore more open to trade since there are no physical borders.
However, this same factor turns into a serious disadvantage in times of war. The lack of physical borders makes countries easier to invade, as was probed in the numerous cities captured by the Nazi regime in WWII. Disease transmissions and undesired immigration are also a frequent problem with open borders.
<span>That is false. The actual definition for the assembly line is this: a series of workers and machines in a factory by which a succession of identical items is progressively assembled.
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Like many nomadic pastoral cultures, the Mongols had a segmentary society, originally organized into a hierarchy of families, clans, tribes, and confederations. While social classes including nobility, herders, artisans, and slaves existed, the social structure was not completely rigid and social mobility was possible.
A is the answer explantion
