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. 

Example Input: Green is a color that gathers sunlight easily. Sunlight is gathered by the leaves of the plant. The sunlight is broken down into glucose through photosynthesis. The glucose travels the plant. The plant uses that glucose as energy to grow. 
Example Output: sunlight ,glucose ,energy 

Example Input: There is a fetus in the womb. They are born and are a baby. The baby grows into a child. Puberty turns the child into an adolescent. The adolescent becomes an adult. An adult becomes an elderly person. The elderly person dies. 
Example Output: fetus ,baby ,child ,adolescent ,adult ,elderly person 

Example Input: A plant or animal dies in mud or soil. The bones are all that remains. Over time the bones are covered in sediment. The sediment becomes rock. The rock becomes a fossil. 
Example Output:
plant or animal ,bones ,sediment ,rock ,fossil