Anyone wants to bet that this latest Mars mission will find no ancient bio-mass? And why I say this? Because, if conditions needed for life, have to be Earth like. Then if life emerged on Mars, same as Earth, then the period of planetary stability to allow micro- organisms to develop, should have lasted at least long enough for the emergence of multi-cellular organisms or large animals, leaving a fossil record. And there have been many Rovers looking closely at Mars Rocks, without spotting even a fossil of a plant. Do you care to bet? If you win, then the prize is that I will post a song of your choice in the music section. Or I might win !
Very convinient for Mars magnetosphere to disappear, just at the right time to leave no larger animals or fossil records, and leave perhaps only invisible micro organisms needing a Rover of this type to be sent !