Mars Curiosity Rover has been keeping an eye of Mars to see if has supported microbial Life. Data collected over three Mars years (6 Earth Years) has shown a strange anomaly. When CO2 freezes it lowers the atmospheric pressure and when CO2 evaporates it increases the atmospheric pressure. In line with this change the Nitrogen and Argon show seasonal variation, but strangely oxygen doesn’t show this variation. Although difficult to explain conclusively but it points to the possibility that Oxygen is produced and consumed somewhere else as well . This could be a sign of life