A fossil that can be used as a marker in time is called what?A.A coproliteB.A trace fossilC.A fossil recordD.An index fossil

The correct answer is D. An index fossil.

Explanation:

Index fossils are used in geology and paleontology to help correlate the age of rock layers. These fossils are associated with specific geological time periods and are widely distributed, which makes them useful for dating and identifying the relative ages of the rock layers in which they are found. In contrast, coprolites (A) are fossilized feces, trace fossils (B) represent the activity of organisms rather than their remains, and the fossil record (C) is a collective term for all fossils that have been discovered, and does not refer to a specific type of fossil used as a marker in time.