Answer is A: Mongol made up the ruling class of the Yuan Dynasty
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please write down the complete question next time
Answer: Ethiopia won its right for independence when Italy attempted to conquer it around the turn of the century. While Liberia was never challenged because it was established by Americans for freed slaves so it was not tapered with because of its long his of a pocket state of the US.
Answer:
as it prevent us from germs,virus and other harmful elements