The development of a 365-day calendar shows that some early american civilizations understood which concept
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Ответ:
I hope this helps! :3
Ответ:
The correct answer is A: airplanes enabled soldiers to observe troop movements and locations.
The main use for airplanes in World War I was the artillery spotting and reconnaissance: exploring and gaining information about all activities in the area, before actually attacking.
The aircraft has had an enormous impact and meant a huge help for the soldiers being an important and strategical tool that cooperated with ground forces.