Barrons AP Environmental Science

(D) In  the pre-industrial  stage,  living  conditions  are harsh,  birth   and death

rates are high, and there is little increase in population size. In the
transitional stage, living conditions improve, the death rate drops, and birth
rates remain high. In the industrial stage, growth slows. In the post-
industrial stage, zero population growth is reached, and the birth rate falls
below the death rate.