Solve what’s missing

Hey, i was what is consisted in a sustainable city? like what unique designs they have, etc. for answering ; )

All of the following occurred due to the invention of the railroad except

Which statement is an accurate description of life in mongolia in recent years? the majority of the population now lives in cities. after a brief period of democracy, communists regained control of the government. subsistence farming remains the primary economic activity in the country. relations between mongolia and china are now tense. -gradpoint