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Originally posted by GhostITM
Well, I'm sorry to burst your bubbles guys, but the chances of plant life of any type being on Mars at present are zero. It wouldn't survive.
For one thing, the atmosphere is too thin.....the partial pressure of CO2 in its atmosphere isn't high enough for plants to utilise. Secondly, the UV light which reaches Mars' surfaces is that intense it'd kill the plants immediately.
Last, but not least, the soils on Mars are highly oxidating (they're mostly iron superoxides) and that would kill the plants by destroying their roots.
As for the methane they've detected, it could be from bacteria buried under the surface of the soils or in cracks in the rocks.
Then again, it could be from the breakdown of non biogenic sources of gases such as propane, ethane and carbon dioxide that would be effected by the oxidation in the soils and the UV light.