Use the drop-down menus to complete the sentences. During the Tang and Sung dynasties, the
aided navigation for sea travel.
The development of
produced fireworks and changed warfare.
The use of
increased reading in China.
issued by the Sung dynasty made travel and trade easier for merchants.

all four are b

Explanation:

edg 2020 have a great day

mali had been a state inside of the ghanaian empire. after ghana fell because of invading forces and internal disputes, mali rose to greatness under the leadership of a legendary king named sundiata, the "lion king." the songhai empire, already weakened by internal political struggles, went into decline.

european feudalism was a combination of legal and military customs in medieval europe that flourished between the 9th and 15th centuries. broadly defined, it was a way of structuring society around relationships derived from the holding of land in exchange for service or labour.

japanese feudalism. the era of feudalism in japan took place from the 12th through 19th centuries. during that period local rulers, either powerful families or military warlords, dominated the land, while the emperor was merely a figurehead and not a significant political presence.