Instructions: 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. 
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. 
Output:
stamen and pistils ,pollen 