The use of trench warfare had which of these effects on world war i? a) it made conquering new territory difficult for opposing armies. b) it made navel power more important than in previous wars. c) it reduced the effectiveness of poison gas and machine guns. d) it led to a significant decline in the death rate among soldiers.

answer: ensure protection from communism

explanation:

the north atlantic treaty was largely dormant until the korean war initiated the establishment of nato to implement it, by means of an integrated military structure: this included the formation of supreme headquarters allied powers europe in 1951, which adopted the western union's military structures and plans.

a.) are both appointed for life