Final answer:
Geographical barriers in Japan, Korea, and Southeast Asia hindered the development of agrarian societies. However, each culture used specific technologies and social practices to transition to farming.
Step-by-step explanation:
Geographical barriers to the development of agrarian societies in Japan, Korea, and Southeast Asia included the mountainous terrain of Japan, the island geography of Southeast Asia, and the porous borders and natural disasters that hindered cultural unity and social stability in the region. Despite these barriers, each culture was able to transition from hunting, gathering, and fishing to farming through the use of technologies and social practices specific to their respective cultures.
In Southeast Asia, farmers developed rainwater tanks to manage water supply and grew rice in paddies. They also practiced slash-and-burn agriculture and migrated after the soil was exhausted. In Korea, techniques of growing millet and rice were imported from the mainland, while in Japan, domesticated rice was adopted from the Korean peninsula.