What was two continuities and changes between World War 1 and World War 2?

One continuity between World War I and World War II was the use of trench warfare, although it evolved into more mobile forms of combat in the latter conflict. A significant change was the scale and technology of warfare; World War II saw the introduction of advanced weaponry, such as tanks, aircraft, and eventually nuclear weapons, leading to higher casualties and broader destruction. Additionally, the geopolitical landscape shifted dramatically after World War I, with the rise of totalitarian regimes, which contributed to the outbreak of World War II.