You will be given a definition of a task first, then some input of the task.
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. 

The animal dies and the body falls down. It is not eaten by anything. The body falls in a sandy or wet place. The soil forms around the body. Time passes on and the rock forms. Millions years later the fossil forms. A person now finds the fossil. 
Output:
animal; body ,soil ,rock ,fossil 