So if we want to be able to understand, if we want to be able to find those traces of the signatures of life at the surface of Mars, if they are there, we need to understand what was the impact of each of these events on the preservation of its record.
Donc, si on veut arriver à comprendre, si on veut trouver ces traces  de signatures organiques sur la surface de Mars, nous devons comprendre  les impacts de ces évènements sur la préservation des traces.