What directly led to the abdication of tsar nicholas ii?

the russians' defeat at verdun
the revolution of 1905
vladimir lenin's return from exile
the garrison in petrograd joining the soviets

During the 1920s, which president atoped a laissez-faire toward business, which bring about great depression

Due to seriouse dogmatic differences between the orthodox church and the western christian churches, the orthodox xhurch is not in communication with the roman catholic and protestant communities

Explain how scientist from the scientific revolution and the catholic church tie together