Trenches were common throughout the Western Front. Long, narrow trenches dug into the ground at the front, usually by the infantry soldiers who would occupy them for weeks at a time, were designed to protect World War I troops from machine-gun fire and artillery attack from the air.
I think its the letter c because its 1 nitrogyn 2 oxengyn
Answer:
D. Analyzing historical sources
Explanation:
In order to understand well what historical sources are, it is necessary to know that the word "source" here is understood in the sense of "document", that is, something that records the testimony of some event that occurred in the past . In this sense, historical sources or documents are all that human beings have produced in the past, such as the letter the historian found.
As the historian is translating the letter and finding historical details and evidence, we can conclude that the historian shows ability to analyze historical sources.
The overall impact of perestroika and glasnost on the Cold War was that "(C) They helped lead to the collapse of communist regimes in Eastern <span>Europe," since this was and economic and cultural "re-birth" for the East. </span>
