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What year was Invitatorium Deum Verum composed?
Etienne, Bishop of Liège, composed the first Gregorian chants that were used. The date he wrote them is not recorded, but he lived from 850 to 920 AD, and they are believed to have been written in the 10th century, so you have twenty years to play with.
How long is an era?
100 Years,. Correction: Asking how long an era is, is the same as asking how long is a piece of string. An era can be any segment of time that can be distinguished. Such as, the 'Nazi era', 'George W. Bush era'. An era is NOT 100 years, that is a century.
What will our era of time be called?
The current era of time will be called the Digital Age.
This group masterminded the revolution in November 1917?
Vladimir Lenin and the Bolshevik Party masterminded the revolution in November 1917. It is called the October Revolution, though, because it happened on October 25-26, 1917 according to the Julian calendar then in use in Russia. According to the Gregorian calendar then in use in western nations, it was November, because the Julian calendar was 13 days behind the Gregorian calendar.
During which era did mammals become common?
Mammals became the dominant land animals in the early Paleocene period of the Cenozoic era, after the extinction of the non-avian dinosaurs at the end of the Cretaceous period of the Mesozoic era.
