Biological invasion mainly refers to the entry of organisms that are not in the original environment. In fact, there are good and bad biological invasions. For example, we introduce a species to maintain the ecological balance of the environment. For example, dung beetles were introduced into Australia to solve the problem of a large number of animal wastes in Australia's animal husbandry and natural environment, and some introduced organisms to replace the food chain function of another organism in the environment. What I said above may not be called biological invasion in some ways. Let me mention that, of course, many creatures invade the new environment, which will cause great damage to the environment. Because these creatures have no natural enemies after entering, they are rich in food, which will lead to mass reproduction, eventually destroying the entire ecological balance, and may also lead to the extinction of native species. There will be many examples of online search, so I won't play copy and paste. As for prevention and control, the first thing is to cut off the source, plant and breed various plants properly, and prevent the introduction of harmful species. Once it happens, it takes a long process to eradicate them, so it is best to nip in the bud. I hope it helps you. You can search for biological invasion on Baidu and click on the following cases, which contain various cases of biological invasion.