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.

Explain how earth is like a giant bar magnet. how is our magnetic field made?

Jerrold has to buy 12 copies of a textbook which costs $36.25 per copy. how much must he spend for them?

The main reason that you should secure loose objects in your car before you drive is that a. objects too close to the engine may be affected by the heat b. they are likely to get damaged moving around your car c. they may be thrown into a spot that disrupts your driving d. they will be more easily retrieved from a single storage location