No. It has little oxygen.
no
there is NO living life on Mars b/c there is no liquid water on it.
No
mars and earth
There is no chance of life on Mars. There was once life on Mars. But as a result of the activities of its landscape, the atmosphere if filled with poisonous gases cannot sustain life, and there are also a lot of volcanoes and earthquakes everywhere in Mars.
It's ability to sustain life - despite the vast size of the universe, so far earth is the only planet with the ability to sustain life
earth is the most complex and can sustain life
If the atmosphere on mars was able to sustain life, then yes you would be able to eat there, assuming you had some food.
No, Mercury is too hot to live on.
Mars may have the ability to support life.
Somewhat, but not for sure. Water means that Mars was able to sustain life, but doesn't necessarily prove that there was life on it.
Because scientists think Mars used to sustain life and they need more info.