Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: Fossils are preserved remains or traces of organisms that lived in the past. Most fossils form in sedimentary rock. Fossils can also be preserved in other ways. Fossilization is rare. It's very unlikely for any given organism to become a fossil. Answer: fossils
Output:
What is the term for preserved remains or traces of organisms that lived in the past?