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. 

Q: Bees land on flowers and eat the nectar of the plants. While on the flowers pollen gets on the bee's fur. The bee flies to another area with other flowers. The pollen is deposited in that area. A plant is able to reproduce. 

A: bee ,nectar ,pollen 
****
Q: 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. 

A: animal; body ,soil ,rock ,fossil 
****
Q: The coal is placed in a heater. The coal is super heated. The heat is connected to a boiler. The boiler is full of water. The heat turns the water into steam. The steam turns a generator. The generator produces the electricity. 

A:
coal ,heat ,water ,steam ,generator ,electricity 
****