Recall the agriculture (farming) led to civilization. Why do you think the first civilizations developed calendars that kept track of the days of the year?
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answer hone

The reason why is that agriculture is a higly seasonal economic activity. The growth of crops depends largely on the season of the year.

Because agriculture was the most important economic activity of ancient civilizations, these civilizations had to keep track of time, in order to know when to grow the crops, when to collect them, and when to regrow them.

each played a major role in ending the cold war.

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

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