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: The inner portion of the ring is formed during rapid spring growth. The tree's growth slows as the seasons change. The ring's outer growth is more dense. The growth of the tree pushes out the bark of the tree. The tree stops growing quickly in the winter. This seasonal "pause" in growth results in distinct rings in certain tree types.

SOLUTION: bark ,inner portion of the ring

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: Stars burn mass. The star burns until it runs out of fuel. The star can no longer support its weight. The layers of hydrogen press down on the core. The core gets smaller and smaller under the pressure. The pressure causes gravity to get stronger. The gravity becomes so powerful that nothing can escape it. Anything that gets close to it, is drawn into it by its gravity. Light is drawn into it. Light can not escape.

SOLUTION:
Mass ,Fuel ,Gravity