Well, they say they have found Martian rocks in Antarctica. And if those rocks can get here, good chance ours can get there.
And there are few - very few places on Earth that if you pick up a rock, it doesn’t at least have some bacteria in it.
My guess would be the chances of Mars being devoid of life are exceedingly remote.
There are plenty of algae and lichens and fungi that would do very well on Mars, thank you.
Riiiight.
Have you ever been abducted by aliens?