Ended up with the defeat of the Central Powers under the leadership of Germany, <span>also saw the collapse of four Empires-German, Austrian, Turkish and Russian.</span>
I believe the answer is A, Pollution of the environment, hope this helps :)
The correct answer is: An asteroid impact.
The scientists call it the extraterrestrial impact theory. It states that a giant, six mile wide meteor hit the Earth around 66 million years ago. As a consecuence, clouds of iridium dust and other materials were thrown into the air, blocking the sunlight for years. This lead to the extintion of the dinosaurs who were not able to feed themselves as plants didn't grow. Photosynthesis was not possible and food chains could not be completed. When the dust settled the greenhouse gases were locked in the atmosphere causing a general increase of temperature.
They were forced to settle in the suburbs
One way to remember the FOUR main causes of World War I is to remember the acronym M – A – I – N. (M = Militarism, A = Alliances, I = Imperialism, and N = Nationalism.) MILITARISM was one of the four major causes of the war. It was an “arms race.” Because Britain had a large navy, Germany wanted a large navy too.
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Three factors leading to war were factors such as nationalism, imperialism, and a growing arms race or militarism. The two groups of nations developed were called the Triple Alliance and The Triple Entente Alliance. In June 1914, a Serbian killed Archduke Franz Ferdinand, the heir to the throne of Austria-Hungary.
