In this task, you are given a paragraph, and your job is to generate comma-separated entities present in the given paragraph. Generate entities from a given passage in such a way that (i) they are present in the paragraph, (ii) they are non-duplicate, (iii) they underwent a state change during the process. Avoid creating entities that (i) aren't present in the process paragraph and (ii) aren't significant. 
Q: A plant dies. The remains of the plant are buried very fast in sediment. The soft parts of the plant decay. The hard parts of the plant are replaced with minerals. The sediment turns into rock. The rock erodes. The fossil appears on the surface of the ground. 
A: 
plant ,soft parts of the plant ,hard parts of the plant ,minerals ,sediment ,rock ,fossil 