Mars Gullies Could Harbor Martian Biology

Researchers comment on the surface of Mars, and how many of the dramatic surface structures were due to recent climate cycles. These climate cycles along with the surface structures, have hinted that water is on Mars. There is also footage from a spacecraft of water seeping through freshly cut gullies and gaps on Mars' surface. Researchers propose that the only other alternative to the formation of these new gullies are: "Gushers of liquid carbon dioxide, melting ground ice in the upper regions of the soil, liquid water from dissipating snow packs, shallow or deep aquifers, as well as dry landslides." Unfortunately, no present theory can conclusively explain these newly formed gullies.
http://www.space.com/scienceastronomy/mars_experiments_030407.html