When two or more variables are intertwined in such a way that conclusions cannot be drawn about either one a researcher would say that has occurred.

Which of the following is an advantage of using nuclear power plants to produce electricity?

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.

The physical feature that makes up part of the border between canada and the united states is the