How did the development of trench warfare influence the course of world war i

There were many ways in which the development of trench warfare influenced World War I. One of the most important were the health problems that trenches caused on soldiers. Apart from that, another characteristic of the trenches warfare was that it conducted the battles really close. Trenches made armies re-think about the strategies they were using in order not to commit the same mistakes again.

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