In Chile’s Atacama Desert called Laguna La Brava, scientists have been studying a purple band of photosynthetic microbes that live in a high salt lake that never has oxygen. Foreign media said in the report that scientists have found the only microorganism in the above-mentioned zone that can survive without oxygen at all, and the microbial mat has existed on earth for at least 3.5 billion years. However, during the first billion years of its existence, there was no oxygen available for photosynthesis on earth. < / P > < p > although iron, sulfur and hydrogen have long been considered as alternatives to oxygen, arsenic has not become a potential competitor for oxygen until the discovery of arsenotrophy in salty lakes Sears and mono in California. < / P > < p > if the author is correct and Laguna La Brava’s microbes are indeed “breathing” arsenic, these will be the first life forms to breathe arsenic in a permanent and completely anaerobic microbial mat, similar to the Precambrian environment we predicted. < / P > < p > according to scientists, when looking for evidence of life on Mars, people will also pay attention to iron. Maybe in the future, they can also pay attention to arsenic, which is not just poison. Privacy Policy