Answer:
B. to refer to periods of time
Explanation:
Historians use terms such as A.D., B.C., decade, and century to to refer to periods of time.
Answer:
Pour acetone and antkiller into the river. Rent a pickup truck, recruit a few of your friends using pizza, put on some latex gloves and take trash bags out of dumpsters. Proceed to empty the bags into the river. If you want to reduce pollution, lobby the local goverment to make laws against dumping in the river.
The correct answer to this open question is the following.
The changes to Chinese administration and bureaucracy that Song rulers introduced were the following.
The Song dynasty produced changes in ancient China. Its leaders were committed to work and develop notorious advancements such as the use of the compass for exploration, the use of gunpowder to wage war and other uses such as construction, and invested so much in the formation of its standing navy, culture, arts, education, literature, and philosophical studies. Confucianism had a second "fresh air" with the studies of philosophers such as Zhu Xi and Cheng Yi.
Bureaucracy was centralized under the Song dynasty and demanded its bureaucratic officials to work with virtue and high moral. Indeed, they had to pass difficult examinations and evaluations to be part of the Song bureaucratic system of government.
The Song dynasty started in 960 and ended in 1279.
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