Task: Question Answering
Input (English): Process:  -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 -
 Question: What is the effect of isotope is less stable on there is an increase in pollution.?
Output (English): none