Me i really need which of these was an accomplishment of the han dynasty? the invention of the seismograph finding a water passage to europe the invention of the ballpoint pen the invention of the abacus

answer

The first (if you can say it that way) seismograph was invented by the scientist and astronomer Zhang Heng, a fact that took place during the regency of the Eastern Han dynasty.

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)

explanation:

damn girl thats not really your friend then. : /