What organisms are usually the pioneer species in anew area? How do these organisms prepare the area for other species

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.

What caused the settlement of more african americans in the mississippi alluvial plain region than in the ozark mountains point)

Any study/memorization tips? i have exams in a week and it would be great to try suggestions!you ; )