What was the main use for airplanes in World War l?

What was the main use for airplanes in World War I? Airplanes enabled soldiers to observe troop movements and locations. Airplanes allowed for the quick movement of resources. Airplanes eliminated the need for soldiers in the trenches.

Explanation: In my words i think because if they need to shoot from high ground insted of from the floor so they can get a better shot.

“a committee reviews the bill and marks it up to make it more viable and to reflect interests 

the right answer is the third one: turnpikes went short distances to connect markets. turnpikes, also known as toll roads, were very important for trade and transportation (of people, goods and products) in the 19th century, coinciding with the expansion towards the west. they contributed significantly to the economic development of the united states.