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Whatever organic chemicals may be produced on Mars or delivered to Mars face several possible modes of being transformed or destroyed. Organic chemicals are molecular building block of life, although they can be made without the presence of life. Whether or not organic chemicals are produced by processes on Mars, some are delivered to the planet aboard meteorites and dust from asteroids and comets.

The Serpent Dust Devil of Mars by NASA: Image by the High Resolution Science Experiment camera on NASA's Mars Orbiter (HiRISE), this dust devil was shot on a late spring afternoon in northern Mars and measures more than 1/2 mile in height. #Dust_Devil #Mars #NASA

Alien organisms may betray their presence by pumping stinky chemicals into their home planets' skies, researchers say.

The toxic chemical perchlorate may be good news for the possibility of life on Mars, but it will pose a danger to exploring astronaut crews.

This graphic offers comparisons between the amount of an organic chemical named chlorobenzene detected in the "Cumberland" rock sample and amounts of the same compound in samples from three other Martian surface targets analyzed by NASA's Curiosity Mars rover.

from io9

Martian chemicals are great for microbes, possibly toxic to humans

NASA's Curiosity rover has found definitive proof that water once ran across the surface of Mars. NASA scientists say that new photos from the rover show rocks that were smoothed and rounded by water.

Data graphed here are examples from the Sample Analysis at Mars (SAM) laboratory's detection of Martian organics in a sample of powder that the drill on NASA's Curiosity Mars rover collected from a rock target called "Cumberland." SAM's analysis of the Cumberland sample yielded the first definitive detection of any Martian organic chemicals in material on the surface of Mars.

NASA's Finds "New 'Gray Mars' Where Conditions Once were Favorable for Life". Scientists identified sulfur, nitrogen, hydrogen, oxygen, phosphorus and carbon -- some of the key chemical ingredients for life -- in the powder Curiosity drilled out of a sedimentary rock near an ancient stream bed in Gale Crater on the Red Planet last month.