Exotic species will cause rapid and huge damage to the ecological environment, taking the snail Ampullaria canadensis, which can be seen everywhere in rice fields, as an example. This kind of snail has strong reproductive ability, strong adaptability to the environment and great destructive power. They can eat many things, whether it is rice in rice fields or aquatic plants in water. But what is even more frightening is their fertility.

Alien species have no natural enemies. There are many kinds of organisms in China's ecological circle. Why hasn't the ecological balance been broken? Because it is a natural food chain, there are many natural enemies in the middle and lower levels. Although they are fertile, they are limited by natural enemies and their numbers will be limited. But these alien species are different. After they were introduced into China, there were no natural enemies at all. With their breeding speed, they will soon become a large-scale ethnic group.

The existence of alien species will affect the survival of local organisms. After the introduction of these exotic species, they will quickly destroy the local ecological environment and compete with local creatures for food. Therefore, the number of native creatures will be suppressed. If it is more serious, it will even become extinct. Biological invasion mainly refers to the process that organisms invade the new environment by natural or artificial means, including intentional or unintentional introduction, which causes economic losses or ecological disasters to biodiversity, agriculture, forestry, animal husbandry and fishery and human health. National biosafety belongs to non-traditional security and is an important part of national security system. Biological invasion will affect individuals, genetics, populations, communities, ecosystems and other levels, leading to species endangerment, extinction and loss of biodiversity, seriously affecting the structure and function of the original ecosystem. Biodiversity is the material basis for human survival and development, and it is also the key to ecological security. However, biodiversity is seriously threatened, species extinction is accelerated, genetic diversity is sharply reduced, and ecosystems are seriously degraded. Therefore, it is everyone's responsibility to resist alien invasive species, because it is also closely related to our lives.