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Which university are you at? <a href=" http://www.coloadaptationprofile.org/index.php?revatio-cost-canadian ">buy sildenafil citrate online</a> Curiosity has found some evidence for carbonate rocks on Mars. Grady said she and many other scientists are keen to see the rover find some of these and analyse them. The rocks form in the presence of carbon dioxide, which on Earth is a product of respiration, and is important for photosynthesis and the carbon cycle.