Research from Natalie Cabrol suggests taking a fresh look at Martian life. Cabrol is director of the Carl Sagan Research Center at the SETI Institute. She believes that, like on Earth, a possible past life on the Red Planet should have maintained a strong connection with changes in the environment. In addition, the destruction of the atmosphere would be obliged to change life forms, and therefore should not look for anything familiar to our planet.
Changes in life forms based on environmental changes are called co-evolution. If so, then when searching for biosignals, we should not focus on earth processes. Of course, Mars was like Earth, but their conditions were different.
Biological processes in early Mars were in an environment of irreversible atmospheric collapse and serious climate change. Understanding co-evolution can lead us to potential ancient habitats.