Answer:
The Indo-European migrations started at around c. 4200 BC. through the areas of the Black sea and the Balkan..
Answer:
The answer is C
The gray tones reinforce the mood of impending doom that will come if factory workers are not dedicated.
Explanation:
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It was "B. a revolution within Russia" that caused Russia to exit World War I in 1917, since the communists removed the Czar from power. It should be noted that this eventually led to the Czar's execution.