TASK DEFINITION: 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. 
PROBLEM: 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. 

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

PROBLEM: Animals pull a fruit off a plant or pick a fruit up from the ground. Animals eat the fruit. Animals drop some seeds onto the ground. Animals eat some seeds. The seeds are in the animal's waste. The waste goes onto the ground. There are seeds on the ground in different areas away from the plant. 

SOLUTION: fruit ,seeds ,waste 

PROBLEM: A frog lays eggs in the water. Tadpoles develop inside of the eggs. The eggs hatch. The tadpoles eat and grow. The tadpoles grow legs and form into frogs. The frogs leave the water. 

SOLUTION:
frogs ,tadpoles ,eggs ,legs