Question

Groups of fossil plants and animals follow each other in a definite and determinable order, and any period of geologic time can be recognized by its respective fossils. this is a statement of the _____.

Answer 1

your answer the principle of fossil succession.

Answer 2

Had to look for the options and here is my answer.
The answer that best fits the blank above is PRINCIPLE OF FOSSIL SUCCESSION. This principle states that fossils appear in an order chronologically in a vertical manner. Hope this answers your question.