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.
Então se quisermos ser capazes de entender, se quisermos ser capazes de encontrar  esses traços das marcas da vida na superfície de Marte, se elas estiverem lá, precisamos entender qual foi o impacto de cada um desses eventos na preservação de seu registro.