instruction:
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. 
question:
A forest fire starts. The fire surrounds the vicinity. The animals are trapped. Those that survive have their habitat destroyed. The survivors must find a new habitat. Conflict with other animals occur. 
answer:
forest fire ,animals ,habitat 


question:
He air we breathe contains oxygen and other gases. Once in the lungs, oxygen is moved into the bloodstream and carried through your body. At each cell in your body, oxygen is exchanged for a waste gas called carbon dioxide. Your bloodstream then carries this waste gas back to the lungs where it is removed from the blood stream and then exhaled. Your lungs and respiratory system automatically perform this vital process, called gas exchange. 
answer:
air ,oxygen ,carbon dioxide; waste gas 


question:
Plants produce fruit which contain seeds of the plant. An animal eats the fruit from a plant. The animal digests the fruit. The seeds are not digested. The seeds pass through the animal's digestive system. The seeds are in the animal's droppings. The seeds are now in another location and can grow. 
answer:

fruit ,seed 


