Could the early environment of Mars have supported the development of life?
Early in its history, conditions on Mars may have been suitable for the origin of life.  From the biological perspective, there are many similarities between Earth and early Mars.  A better understanding of the environment on Mars may provide new insights to how life originated on Earth.
McKay
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Space Sciences Division, NASA Ames Research Center, Moffett Field, California, USA.
Stoker
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CR
D002245:Carbon Dioxide / Q000032:analysis; D018534:Earth, Planet; D018559:Exobiology; D005118:Extraterrestrial Environment; D055593:Geological Phenomena; D005844:Geology; D018535:Mars; D009584:Nitrogen / Q000032:analysis; D000069497:Origin of Life; D010100:Oxygen / Q000032:analysis; D014867:Water / Q000032:analysis
D014867:Water; D002245:Carbon Dioxide; D009584:Nitrogen; D010100:Oxygen