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.

Example Input: Humans are born as babies. Babies become infants. Infants become children. Children learn skills. Children become teenagers. Teenagers undergo puberty. Teenagers become adults. Adults have children. Adults become elderly. Elderly humans die.
Example Output: babies ,infants ,children ,teenagers ,adults ,elderly

Example Input: The planter must select a crop. The soil is prepared properly for that specific crop. Fertilizer is added to the soil. Seeds are planted in the field. Irrigation is set up to keep the crops properly watered. The crops grow. The crops are harvested.
Example Output: crops ,fertilizer ,seeds

Example Input: A flowering plant has stamen and pistils. An insect ot bird lands on the plant. Some of the pollen sticks to it. The insect or bird travels to another plant of the same species. The pollen is tranferred to the new plant.
Example Output:
stamen and pistils ,pollen