Doubtless there was some form of cultivation: starchy yams and taro, possibly originating within the continent, were lifted, the starch from them formed right into a sort of bread. This incipient agriculture appears to be relevant to a cultural florescence in mid-Jōmon instances that lasted about one,000 a long time. https://archervhovf.blog4youth.com/29382712/5-essential-elements-for-shokupan-bread