In this task, you are given a paragraph, event and an entity. The event is part of the given paragraph and it changes the state of the entity. Your task is to classify the state of the entity into three classes: 1) not exist, 2) unknown location and 3) known location. "not exist" means the entity doesn't exist in that state anymore. "unknown location" means the entity exists in that state but location is unknown. "known location" means the entity exists and location is known. 

[EX Q]:  "process paragraph : : Pollution enters natural water sources such as rivers and lakes. The pollution negatively affects the water quality. The pollution negatively affects the health of plants and animals. The plants and animals have shorter, less healthy lives. The plants and animals do not reproduce very well. The number of plants and animals decreases over time. The quality of water gets worse and worse as there are no plants or animals to clean it. Eventually there is nothing living in the water and it is unusable. ", "event : The pollution negatively affects the water quality.", "entity : pollution" 
[EX A]:  known location 

[EX Q]:  "process paragraph : : The blood sugar drops in a body. Cells in the pancrease release glucagon. The liver in response turns the glucagon into glucose. And releases it into the blood. The blood sugar levels are restored. ", "event : Cells in the pancrease release glucagon.", "entity : glucagon" 
[EX A]:  known location 

[EX Q]:  "process paragraph : : 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. ", "event : The tree's growth slows as the seasons change.", "entity : bark" 
[EX A]:
 known location