While I'm willing to believe that some kind of life is possible on mars, or any of the planetsI'm never sure which dimension we live in, the third or the forth? Whichever, it is possible that life on Mars lives in a different dimension. On Earth we have creatures living in ice and at great depths in the ocean where most creatures on Earth could not live. So it is possible for life to exist on any planet, just not life as we know it. Until we open our minds to greater possibilities, we will not be able to perceive anything outside our limited belief in what is possible.
for that matter, hell, there could be some kind of cave dwellers living on fungus but I tend to think
that mars is dead like our moon.