Constantinople was able to survive due to its <em>strategic</em> location and <em>sofisticated</em> system of fortifications.
Constantinople was able to survive as the <em>central</em> hub of the European culture throughout the early 1000s due to its strategic location, the city was located in a strait between the Black and Mediterranean Seas, between Europe and Asia, which allowed the city to be prevented from many invaders, from Hunes to Arabs.
In addition, the city counted with a sophisticated system of fortifications which made impossible any attempt of siege until the appearance of first developments on modern artillery in the 15th Century, and the city was well communicated with the most important nations in Eastern and Western Europe by sea (i.e. Italy, Carolingian Empire, Kiev' Rus), of which the city may receive reinforcements in desperate situations.
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The Paleolithic, Mesolithic and Neolithic eras occurred during the Stone Age. The correct option among all the options given in the question is option "C". The Stone Age is actually a large period of time and is considered to have covered around 3.4 million years. The Stone Age is thought to have ended anywhere between 6000BCE and 2000 BCE. It was the age when stones were widely used to serve different purposes of the people living during that time. The stones were sharpened and widely used as hunting tool by the people of the Stone Age.
One of many reasons why FDR's first hundred days in office so extraordinary was because "<span>b. He got an impressive amount of legislation passed in a relatively short period of time," since he took a very proactive role in the economy. </span>
One similarity between the Nile River valley and savanna lands in Africa is that they both "<span>(2) provided necessary resources for settlement," since these areas offered rich soil and other resources that were essential for the development of sustainable societies. </span>
