10. evaluate the impact of the mongols, including genghis khan, invasions of russia,
china and the islamic world, centralized power, religious tolerance, interregional
trade, and reasons for decline.

Social darwinism refers to the the theory that people who succeed in our economic system will one day out compete those who fail. one day the rich will out succeed the poor so we'll that there will eventually be no more poor

Population growth is one way

The answer is lunch on the go