It has been estimated that the numbers of species known through fossil records are far less than the numbers of known living species. Based on the information, a student listed several reasons for the lack of fossils from all organisms of the past. Which statement should be part of the list made by the student? A. The organisms that existed had a hard outer covering.
B. The dead remains of the organisms were buried in sediments.
C. The organisms were buried quickly and deeply during a catastrophic event.
D. The dead remains of the organisms were disturbed by natural forces.