In stage 1 the two rates are balanced. In stage 2 they diverge , as the death rate falls relative to the birth rate. In stage 3 they converge again, as the birth rate falls relative to the death rate. Finally in stage 4 the death and birth rates are balanced again but at a much lower level.
They are all diffrent kinds of colors when im out with my crew on army runs in fall i see all diffrent kinds of colorful tree leaves the color seeps out of them and there regenterarted next year when it turns towards spring