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: Bacteria changes nitrogen into ammonium through fixation. The nitrification process is where ammonium gets changed into nitrates by bacteria. Plants absorb the nitrates from soil into their roots through assimilation. When plants die, fungi and bacteria turn nitrogen back into ammonium through ammonification. The denitrification process pushes extra nitrogen from soil into the air. The cycle repeats from step 1.

Answer: nitrogen; nitrates ,ammonium ,plant ,extra nitrogen

Question: Forest fires burn forests. The animals living in the forest have fewer places to hide. Predators can now find their prey eaiser. Birds will fly away from the area. Waters warm up which hurts the fish swimming in them.

Answer: forests ,places to hide for animals

Question: Waves hit the coast. Waves have energy that pushes the water and sediment. The sediment can help erode land like sandpaper. Water washes the sediment back. Some sediment is left as sand.

Answer:
waves ,coast ,water ,sediment ,land ,sand