Gene editing technologies, such as CRISPR-Cas9, have significantly improved our ability to modify the genes of organisms. This technology can be used for a variety of applications, including studying diseases, developing new treatments, and improving crops. However, in theory, this technology can also be used to create organisms with specific characteristics, including lethal characteristics. However, in reality, several important factors limit such applications: 1. **Technical complexity**: Although CRISPR technology is very powerful, editing the genome of complex organisms is still challenging. Designing and successfully constructing an organism with specific and complex characteristics requires in-depth scientific knowledge and experimental capabilities. 2. **Ethical and legal restrictions**: Most countries have strict legal and ethical regulations on gene editing (especially gene editing involving humans, animals and plants). These regulations and ethical guidelines are intended to prevent potential abuse and protect ecosystem safety. 3. **Ecological risks**: Artificially creating organisms with specific lethal characteristics may pose unpredictable risks to ecosystems. Once released into the environment, these organisms may become invasive species, affecting the existing ecological balance and may have serious consequences. 4. **Safety and responsibility**: Experimental errors or lack of safety measures may lead to the accidental release of potentially dangerous organisms, posing a threat to humans and ecosystems. Therefore, research institutions and scientists need to follow strict safety standards. In view of the above factors, although there are some possibilities from a technical point of view, the application of creating organisms with specific lethal characteristics is highly restricted and dangerous. This type of research not only needs to deal with complex scientific issues, but also involves important ethical and legal considerations.