Answer:
The early leaders of the Zhou Dynasty introduced the idea of the "Mandate of Heaven". ... The government of the Zhou was based on the feudal system. The emperor divided the land into fiefs that were usually ruled by his relatives. The nobles who ruled the fiefs basically owned the farmers who worked their lands.
Operation Barbarossa was the code name for the German military invasion of U.S.S.R (Soviet Union). The invasion was launched on June 22, 1941. Hitler stated that "when the attack on Russia starts, the world will hold its breath." Once winter came around in Russia, German operations were abandoned. Hitler's plan had failed, which was to take control of the Soviet Union before winter.
The soviet union surprising launch of sputnik.
B. Horses and C. Diseases but mostly C
