Answer:
airplanes, farming
Explanation:
At the time of war, particularly world war 1 and 2 the airplane industries developed at a greater pace because some of the powerful warring nations develop airplanes that have greater speed and higher elevation for fighting their opponents during the war.
Similarly, there is an increase in the level of growth in farming industries, as there is a need to use fewer labor supplies to provide food for the countries fighting wars, including their soldiers, by exploring new preservation techniques as well.
