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. 
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Question: Air is brought in through the mouth. Passes through the lungs. And into the bronchial tissue. The carbon dioxide is removed. The lungs bring the oxygen to the rest of the body. 

Answer: air ,carbon dioxide ,oxygen 


Question: A plant dies. Bacteria from the ground migrate to the plant material. Bacteria release enzymes onto the plant material. The enzymes break down the plant cells to simpler components. The bacteria absorb the resulting components. 

Answer: bacteria ,enzymes ,plant cells ,components 


Question: A plant of animal dies in a watery environment. Is buried in mud and silt. Soft tissues quickly decompose leaving behind hard bones or shells. Over time sediment builds over the top and hardens into rock. As the bone decays mineral seeps in replacing it. Fossils are formed. 

Answer:
plant; animal ,soft tissues ,bones ,mineral ,fossils