World war 1 broke out in 1914 because a group of Serbian nationalists (The Black Hand) assassinated the duke of Austria-Hungary. Austria -Hungary threatened Serbia with a bunch of wishes that they wanted Serbia to due for them. Due to the treaty between Serbia and Russia, Serbia said no. Germany, who had a treaty with Austria-Hungary threatened to attack if Russia mobilized its army. Russia did and Germany invaded Belgium. This brought Great Britain and France into the war.
It is important to know there are good and bad bacteria because we can assume that all bacteria is either bad or good, this way know there are both could help us understand in the future what to look out for.
B. a religion based on achievement of nirvana through good living
Its the one that is very cool