What role did world war 1 play in the two revolutions?

The Participation of Russia in the WWI created a major discontent in the Russians, this acted as fuel for the February revolution and October revolution.

Explanation:

The WWI participation of Russia caused a major discontent in the Russian people because of the military defeats and the costs involved in participating in a global war. This discontent created the February revolution liberated the people from the Monarchy political system and planted the roots for the October revolution in which the communist party will become the sole political party in the nation for the following 70 years.  

Both revolutions took place in 1917 and with the October revolution the Russia's participation in the WWI was finished as the Bolsheviks signed a peace treaty with Germany.

the american rail road was the most influential and useful transportation system developed in the 1800's with steam locomotives and in the very late 1800's and early 1900's diesel electric locomotives being used to transport goods and people around the newly expanded united states!

answer; ///i do believe that the correct answer is (d); ///athens had a small population;