**5. Conclusions**

The discovery of organic molecules on Mars is a necessary but not sufficient condition for the demonstration of some present or past form of martian bacterial life. Comets and the carbonaceous chondrites are indeed copious sources of organic material. But the positive results of the 'famous' Viking LR experiment are intriguing, even because it is important taking in account that Viking LR was performed at low temperature, a condition where possible perchlorates do not show any oxidant effects.

*New Insights into the Search for Life on Mars DOI: http://dx.doi.org/10.5772/intechopen.97176*
