What does it mean when world war i is referred to as a "total war”?
many aspects of society were obliterated during the war.
everyone had to serve in the military.
the aim of each side was to destroy the other side completely.
the war efforts needed the participation of as many people as possible.

I believe the answer is: The war efforts needed the participation of as many people as possible

Nuclear bombs were never widely used in wars, (their initial usage in hiroshima and nagasaki basically ended the world war ii).  

Due to the nature of world war i, most of the battle occured on land, especially near the beach of land borders. Because of this, each countries need as many people as possible to draft as soldiers.

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Explanation: