Respuesta :
A fossil index is a plant or animal that is preserved in the clock and records the earth's geologic history.
- It has the character of the particle span of time and the geologic environment. The index fossil must be distinct and easily recognized.
- Hence the option D is correct. Fossil B is the same age as the index fossil.
Learn more about the depths at which an index fossil and three others.
brainly.com/question/14988327.