Identify significant achievements of the progressive era

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

How has the caste system canged in indea and pacistane

What characteristics did the kiowa share with the other plains people? a) they migrated from the same places b) they were nomadic hunters c) they used the horse extensively d) they spoke the common language! and you