Why did African societies develop age-set systems?

What were the main features of the aristotelian-ptolemaic model of the cosmos

Capitalism competed with dominance in the twentieth century communism merchantilism free enterprise feudalism

Plz which of the following statements about the fugitive slave act of 1850 is not accurate? a. marshals you refuse to arrest a suspected fugitive could be find $1000. b. slave owners had to present evidence an african-american in the north was a fugitive slave. c. any person who provided food or shelter to a fugitive slave could be find $1000 and placed in jail for six months. d. it required of federal marshals to arrest any african-american suspected of being a runaway slave.