Why is weapons and technology is important in WWI

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During World War One, there were many technological and scientific advances. The advances were much needed at the time, and changed the nature of warfare, which includes tactics used and their strategy. Scientists and invented worked very hard during the War so that they would have the upper hand during war. These weapons greatly improved efficiency, self-defense, and their warfare.  

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whose power in the senate is equal to the power of the speaker of the house?