All civilizations are underwritten by an agricultural revolution of some sort, history homework help

Please use simpler words and simple sentence structure which is easy to understand to write an essay on the following question: (350-400 words)

All civilizations are underwritten by an agricultural revolution of some sort. Please examine how the rye and oats revolution in Europe, the Arab Green revolution in the Caliphate, and the revolution in Champa rice cultivation in Song China contributed to the development of wealth and commerce in medieval civilization.