Which one of the following contains a list of innovations that resulted from the challenges posed by wwii?

After WWII, the world was left in a complete mess. Japan had it's nuclear devastation and Germany as well as England were in rubble. However, during the course of the war, there were many innovations in weaponry and protection. Also, improvements in field training.

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Um well north korea is a very harsh place because students go to school for 24 hours and almost never rest and the president is well i think sends to much bomb that’s what i think