The says that in a series of sedimentary rock layers, the younger rocks are normally on top of the much older rocks. A) rock theory
B) fossil record
C) law of superposition
D) index fossil

Which units ate used to measure both velocity and speed? check all that apply

Which of the following describes a boom period? a. as one population increases, another population decreases. b. as one population increases, the other population also increases. c. as one population decreases, another population increases. d. as one population decreases, another population also decreases

Which of the following happened during the precambrian era? the first prokaryotic cells the first eukaryotic cells development of photosynthesis all of the above