After staring at a red-and-blue flag for 90 seconds, Cecilia looked at a white sheet of paper and saw a green-and-yellow afterimage. Which theory explains this phenomenon

Which groups of people most directly benefited from song innovations in the song dynasty‘s open border policy?

Which of the following selections is least useful for supporting the claim that states intentionally built unequal school systems? question 1 options: the supreme court ruling in plessy v. ferguson (1896) wrote into law that america had two separate societies: one black and one white. it was very clear by the mid-1900s that southern states had expertly built separate educational systems. these schools, however, were never equal. states with laws keeping schools segregated never gave equal amounts of money to their black and white schools. ten years after brown, fewer than 10 percent of southern public schools had integrated. some areas did not comply at all.

Ais a group of people living and working under a set of rules and traditions.