instruction:
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.
question:
The bat sends out sound waves from their mouth or nose. The sound waves hit an object. Echoes are produced. The echo returns to the bat's ears. The bat hears the echo. The bat can figure out where the object is located.
answer:
sound waves ,echo

question:
You wash the wound. You apply a bandaid or other covering if needed. The blood clots. A scab forms. The skin repairs itself under the protective cover of the scab. The scab falls off.
answer:
Wound ,Bandaid ,Blood clot ,Scab ,Skin

question:
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.
answer:
crops ,fertilizer ,seeds