In each simulation trial, you changed the number of people and measured the number of _ people in the population.

Therefore, the independent variable was the number of people who were
_ , and the dependent variable was the number of people who were _.

immune

infected

immune to the disease

infected by the disease

During metaphase II, the centromeres of the paired chromatids align along the equatorial plate in both cells. Then in anaphase II, the chromosomes separate at the centromeres. The spindle fibers pull the separated chromosomes toward each pole of the cell.