To what extent was Vladimir Lenin significant to Russia’s change from a Tsarist regime to Communism?

The segments shown below could form a triangle.

How would you describe the state of germany between 1815 and 1848

Which of these is not a criticism of the concentric zone model? it does not accurately describe cities after the rise of suburban development. it only applies to cities that grew after the development of the automobile. it assumes that inner-city areas will always be repurposed instead of abandoned. it places too much importance on the traditional central business district.