What change did the mongols bring to china?

a. the mongols established the han dynasty.
b. the mongols established the yuan dynasty.
c. the mongols expanded the tang dynasty.
d. the mongols expanded the song dynasty.

Anthony johnson, an african who arrived in virginia in 1621, a. learned the powhatan language and became a translator for governor thomas dale. b. owned slaves. c. translated the king james version of the holy bible into indian and african dialects. d. was the first slave who purchased his freedom with earnings from growing tobacco.

Why did river valleys most farming impact the lives of neolithic peoples?

Space is not completely empty. there are small particles in space. what happens when these particles come together?