If a toxic chemical came and killed the pythons, then there would be a over population of its food chain this would be and example of Bioaccumalation. Everything would be to populated and all the animals would run out of food because they are eating all of the other animals. All the organisms would eventually become less populated because there would be no food to support it and they would all die and become extinct. The food web has to have enough organisms to support the python this is an example of Biomagnification.