Well, I am not sure about the Mars but I strongly believe that there are many other places in the space where some kind of life exists; and it could be very strange.
I don't think so, if I'm correct this is not the first time they sent a robot and the last time found nothing so this time will happen the same, meanwhile mars is not a good place to have life on it because it doesn't have a healthy environment for living creatures.
maybe mars creatures do not need water or oxygen.. or may be the creatures also not organic. how about atomic creatures ?
Don't worry, we can bring bottled water, canned food, artificial plants, cosmetic items, clothes and also oxygen cylinders etc to mars. also we can create ozone layers. Don't forget 'Nothing is impossible in this universe!'
OF COURSE, There is life on mars but it take a millions of year to settle there like the planet"EARTH"
You're optimistic... Well if we have gotten unmanned spaceships there they might as well get people there in our lifetime... Technology moves so fast...