I don’t think there is life on Mars, if were talking about ‘human’ style life, the conditions are not there for even our basic cells to survive. When we look for life on other planets (exoplanets) we look for very basic building blocks of life that we have evolved from an example being amino acids – we use telescopes to try and dissect the planets atompheres to see if we can find any traces of these cells. So I think not on Mars!
The physics and chemistry and gave us biology here on Earth are governed by rules that are the same everywhere in space. So it is possible that given similar initial conditions elsewhere in space that life might evolve. One place nearby we are looking is the icy moon, Europa, as it is thought that life might exist in the ocean under the ice. In terms of Mars, life evolved pretty quickly on Earth and might have done so on Mars given it had liquid water. But it was soon killed off as the planet cooled and the atmosphere disappeared leaving a ball of rusty rock.
I don’t think there’s any life on Mars these days, but I think a long time in the past there was likely microbial life forms on Mars or something similar. Definitely not green aliens walking around though!
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