Select the statement that best describes the concept of fossil succession. Choose one: A. There is a definite relative order in which each fossil species occurs within the layers of rock on Earth. B. There is a definite relative order in which certain, but not all, fossil species occur within the layers of rock on Earth. C. As you go up in stratigraphy, fossils are older. D. Fossils are randomly distributed throughout the rock record, and the succession through geologic time is irregular.