Answer:The Hijri Year
Explanation:That event took place in 622 AD and marks the start of the annual count. According to the Islamic calendar, 2019 in the Gregorian calendar is the year 1440
There was education for the upper class and general population in that empire.
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Brainliest is very much appreciated
The name of the device is the <span>Fessenden oscillator. It was made to allow submarines to communicate through Morse code. This way they could avoid communication being intercepted.</span>
