The superposition principle states that the oldest rocks occurs on the <span>bottom of an undisturbed rock sequence. In other words, if the layers or rocks have not been disturbed, older rocks will lie beneath younger rocks. The principle is one of the most fundamental principles of geology. It could be very useful in determination of relative age of fossils.</span>
Here's a graph showing the stages. Look closely at the second stage-- the death rate is low but the birth rate is high. It's <span>D. The death rate begins to fall, but birth rates remain high for a time.</span>