Piranhas have many things they need to survive, and when climate change gets to them they have to adapt to their new surroundings and change many things like how they eat and how to get to clean water. Right now the piranhas have clean water and lots of fish to feed on. In one to two thousand years this might change a lot, there might not be as many fish as there used to be, instead of five fish there might be one or two. The water might not be as clean as it used to be. And they're will be a lot of higher tides. There might be a lot of trash and things that make fish and piranhas super sick and they might die due to their surroundings. In this case Piranhas have to change how they live to be able to survive in their new frightening habitat.
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