How did airplane use change as World War I progressed? Military forces became dependent exclusively on airplanes for fighting battles. Airplanes became involved in active battle. Fewer civilians took airplanes because of German threats. Airplane use declined, as there were insufficient materials to build new planes.

What are the two main ideas of this passage? museum experts feel that museums must change to attract visitors. museum experts care more about the number of visitors than about history. museums that display artworks and exhibits do not make families welcome. museums like colonial williamsburg make learning about the past fun. museums in the united states are different than in other countries.