The Second Agricultural Revolution was made possible by all of the following EXCEPT the invention of crop rotation
improvements in drainage and irrigation systems
advancements in farm machinery
the migration from urban cities to rural regions
the application of scientific methods to breeding

answer; ok in rural area most people depend on private transportation(cars),pick up truck,donkey and buggy: ),and urban people can walk or ride public transportation,bus,train cab,uber.

i do believe the correct answer is the spread of chinese culture throughout asia and africa.good luck

explanation: