Which describes an achievement of emperor yangdi that unite china? a. he made marco polo an honored guest at the imperial court in beijing. b. he introduced terraced farming to produce more food. c. he designed a plan for a series of interconnecting canals. d. he built the great wall of china to keep out invading mongol hordes.

true it is correctet because im a   god boi

2686-2181 bce-- "egyptian civilization developed along the nile river in large part because the river’s annual flooding ensured reliable, rich soil for growing crops."

1069-664 bce-- "ancient egyptians developed wide-reaching trade networks along the nile, in the red sea, and in the near east."