Final answer:
The introduction of tanks and airplanes revolutionized warfare in World War I, bringing new tactics and strategies to the battlefield and changing the nature of armed conflict.
Step-by-step explanation:
The introduction of the tank and the airplane as weapons revolutionized warfare in World War I. The tank, first unveiled by the British in 1916, made large artillery mobile and helped end trench warfare. Airplanes were used for reconnaissance purposes and later for strafing trenches with machine guns and dropping bombs. Both tanks and airplanes brought new tactics and strategies to the battlefield, changing the nature of armed conflict.