What was the name of the Abbasid caliph who established the House of Wisdom?

just finished this it is b. centrifugal force

where is the

by 1880, germany had more rail lines than great britain and russia.

accomplishment : zachary taylor’s was a national war hero in his battle in an mexican war

explanation:

he was known as a national war hero for his battles in the mexican war, taylor was elected as the 12th president of the united states in 1849. he led the nation during its debates on slavery and southern secession. after serving only 16 months in office, taylor died from cholera morbus on july 9,