The primitive food chain is mutually exclusive, so that different species can continue to survive in nature, piranhas have a nemesis even if they are fierce.

This phenomenon could not be detected through traditional dietary research methods, but by using DNA-based techniques, such interactions were revealed for the first time, leading to important questions about how human activities affect wildlife.

In the history of human development, "Learning to use fire" Was undoubtedly a very important point, as through the manipulation of fire, human beings were able to process various ingredients in nature into easily digestible and absorbable cooked food, to exert a powerful deterrent on other animals, to dispel darkness and cold, to harvest light and warmth, and thus step by step, a glorious civilisation has been created.