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Heres a couple of the main contributing factors; Only dealing with the surface of Mars!and no referance to its polar region!

The atmosphere on mars is to thin to sustain liqiud water and is continuously bombarded by cosmic rays such as UV rays and inturn has sterlized the surface of the Planet.

the loss of its atmosphere has been stripped away by solar storms; bombardment of metorite impacts plus volcanic expolsion from Mars itself in its tutbulent past. The Martian atmosphere lacks an ozone layer for protection.

Example H2O, liquid water is the prime ingredients for life as we know it. and as liquid water isn't present on Mars - at the surface anyway this can be elimanated, and if any found its way to the surface it would dissacociate (spelt this wrong ).

H2O: where the hydrogen would be lost to space - most of it anyway because of its light weight and most of the oxygen is oxidised into the soil - hence its redness more complicated than this, but gives the basics anyway.

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