Professor: potential for finding past Martian life

After the success of discovering ice water on Mars, some scientists say that a serious search for life would likely move towards the Martian north pole, where the ice water sometimes melts. However, the melting and refreezing of water could also erase records of previous life or organic material. "We don't know exactly how fast the ice comes and goes," says Jack Farmer, ASU astrobiologist. "If it's on a routine basis, then you may end up losing the biosignatures." Farmer and other scientists may prefer a region that remains frozen year-round, preserving organic material and possible traces of past life in the ice.
Article source: Space.com