It wasn't until the third century b.c. that techniques of rice cultivation (and wheel-made pottery) arrived from Korea, along with irrigation methods that are still in use today.
Techniques of rice cultivation led to civilization.
mnli hypothesis: Techniques of rice cultivation led to civilization. premise: It wasn't until the third century b.c. that techniques of rice cultivation (and wheel-made pottery) arrived from Korea, along with irrigation methods that are still in use today.