The bio threat of aliens is more real than ever! In an article by Anthony Riccardi of McGill University, Canada there are strong warnings about the dangers facing humanity. In his opinion, extraterrestrial organisms can be delivered to Earth from space and are a real threat to all biological life on our planet. Reported by SciTechDaily (https://bit.ly/3DDs8AQ). According to Anthony Riccardi, the most vulnerable are the few endemic species that are widespread, for example, on a small isolated earthly island. Such species can be destroyed by alien microorganisms that astronauts themselves or space tourists can bring to Earth. In addition, the scientist believes that together with terrestrial endemics, people will also have to protect the alien organisms themselves, because they, too, are in danger after they enter our planetary environment. Most likely, the cosmic future of humanity will not be easy. However, it is unlikely that earthlings will dare to retreat and stop space exploration.