Answer:
Petroleum was used as fuel as early as the fourth century BC.
Explanation:
<span>The collapse of the Soviet Union in 1991 marked the end of decades of _______________ rule in the nation.
Answer:B) Communist
Explaining-</span><span>The collapse of the </span>Soviet Union<span> in 1991 marked the end of decades of </span><span>Communist </span><span>rule in the nation. Communism had been the dominant type of government in the country since the Bolshevik Revolution in 1917.</span>
Answer: "<span>positive incentive value" .
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