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. 

[Q]: Blood delivers oxygen in the body. Proteins and acids are broken down in the liver. The liver releases waste in the form of urea. The blood carries the urea and carbon dioxide to the kidneys. The kidneys strain the urea and salts needed from the blood. The carbon dioxide by product is transported back to the lungs. Carbon dioxide is exhaled by the lungs. 
[A]: oxygen ,proteins and acids ,waste ; urea ,carbon dioxide ,salt 


[Q]: Over 99% of the exocrine pancreas cells produce digestive juices. They secrete digestive juice "externally" into the small intestine. There are enzymes for breaking down fats, proteins , and carbohydrates. Digestive juices flows from the pancreas through an excretory duct into the small intestine. When the blood sugar levels rise, as they might after a meal, insulin is released. When blood sugar levels are too low, the pancreas releases glucagon into the bloodstream. 
[A]: digestive juices; digestive juice ,insulin ,glucagon 


[Q]: A stream or river must occur. Through erosion, the stream cuts into the soil and bedrock. Through continuous erosion, a deep gash is cut through. After many years the river may dry up. A dry ravine is left. 
[A]:
stream; river ,soil; bedrock ,gash ,dry ravine