What advances in farming occurred during the song dynasty

The Song dynasty if a period with the most extraordinary progress in China´s history.  One of the most important innovations in farming was the development and use of a new rice cultivation techniques and rice varieties. Examples: the early-ripening rice variety that allowed farmers to have two or three crops per year, thus increasing the amount of food available for human consumption; drought-resistant rice varieties; better systems of water control and irrigation.

Explanation:

b. major john c. frémont led a rebellion called the bear flag revolt.

explanation:

during the bear flag revolt, from june to july 1846, a small group of american settlers in california rebelled against the mexican government and proclaimed california an independent republic. the republic was short-lived because soon after the bear flag was raised, the u.s. military began occupying california, which went on to join the union in 1850. the bear flag became the official state flag in 1911.