Final answer:
World War I introduced new advanced weaponry like machine guns, tanks, and aircraft, changing the nature of warfare.
Explanation:
Machine guns: Introduced in World War I, they were able to fire multiple rounds quickly, changing the dynamics of warfare.
Poison gas: A cruel weapon used for the first time in WWI, causing horrific injuries and deaths.
Tanks: Revolutionary armored vehicles that could traverse difficult terrains, providing protection and firepower.
Aircraft: Used for reconnaissance and bombing, changing the nature of aerial warfare.
Artillery: Improved with new types and technology, increasing firepower and range.
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