Which of the following developments helped increase the Chinese population
under the Tang and Song dynasties?
A. gunpowder
B. roads and canals
C. moveable type

What notable contributions to science has sandia national labs (snl) produced over the years?

How does the existence of a site like catus hill demonstrate the challenge that archaeologist face when making theories?

The massacre at sand creek was an attack by a colorado militia on peaceful american indians. a colorado militia on a group of dakota warriors. american indians on peaceful white settlers. federal soldiers on a group of cheyenne warriors.