Who defeated germany in battle of marne

What is the main idea of this excerpt? 1.1.3

How did the actions of tsar nicholas 2 and his wife lead to revolution in russia

How did inca develop their road system? a) they used mortar to hold the stones together.b) they built suspension bridges over rivers. c) they mixed copper and stone together to make the blocks.d) they laid roads in the cities, not in the less densely populated deserts.