Which of the following describes the most important effect the tank had on world war i?
the tank ended the use of trench warfare.
the tank caused the war to last longer by killing so many soldiers.
the tank proved to be ineffective against the bombs and guns of the central powers.
the tank increased use of trench warfare in world war ii.

Which statement describes the primary purpose of the european union? question 1 options: to protect european nations in the event of another world war to work together to strengthen europe and benefit all member nations to prevent alliances from forming between member nations to share resources and make economic trade easier between coal and steel companies