Final answer:
The Law of Faunal Succession is based upon the observation that fossil species succeed one another through layers in a predictable order. The correct answer is d)
Step-by-step explanation:
This law of geology is focused on the temporal sequencing of fossil content, highlighting that different layers of sedimentary rocks contain distinct and identifiable fossil assemblages that follow one another in a vertical sequence. As one of the principles of relative dating, the Law of Faunal Succession allows scientists to determine the relative ages of rock formations and to index fossils, thus providing insights into the history of life on Earth.
The Law of Superposition, although closely related, is based on the stratigraphic concept that in undisturbed sedimentary rock layers, the oldest layers are at the bottom and the youngest are at the top. This principle is pivotal for relative dating but does not directly address the succession of the fossil species itself. The correct answer is d)