An advancement in the field of learning that took place during the Han Dynasty:
the writing of Historical Records by Sima Qian
Sima Qian created the Grand Scribe’s Records which is still used by modern historians.
The one that was a national study of police practice is :
crime stoppers
It's a non profit organization working with the law enforcement
hope this helps
Answer:
Years of schooling is the correct answer.
Explanation:
