Short note on a span of time in history
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The concept of "span of control," also known as management ratio, refers to the number of subordinates controlled directly by a superior. ... It arose from the assumption that managers have finite amounts of time, energy, and attention to devote to their jobs.
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Explanation:
The term classical antiquity is often used to refer to history in the Old World from the beginning of recorded Greek history in 776 BC (First Olympiad). ... The Middle Ages is the middle period of the three traditional divisions of Western history: classical antiquity, the medieval period, and the modern period.
Modern period is the longest period in human history. Prehistory is the period before written history and early human migration in the lower palelithic saw home which erectus spread across the 1.8 millions of years ago.