The answer you are looking for is "<span>a. elements of ecosystems are mutually dependent on each other ".</span>
I would say B. Ever hear the phrase, "warm air rises"?
Answer:
Index fossils, intrustions and cross-cutting relationships.
Explanation:
The correct list of three different geologic features that help scientists determine the relative ages of rocks by their position is "index fossils, intrusions, and cross-cutting relationships".
