They were classified into four social classes: the king and aristocracy, the military, artisans and craftsmen, and peasants. Members of the aristocracy were the most respected social class, and were responsible for governing smaller areas of the dynasty.
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He built Canada's second transcontinental railroad to strengthen the ties that bind us together
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D) Each solar system contains billions of galaxies
Think, there are no other galaxies from the sun to Pluto (not a planet but still in our solar system) and the answer said EACH solar system and, a Galaxy contains solar systems not the other way around.
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D. Stalin replaced Vladimir Lenin upon his death in 1924.