Sore throat is a symptom, not a disease. In each case, there was a different cause that dictated a different treatment. The scratchy throat probably was a mechanical problem caused by dry, heated winter air and aggravated by my friend's tendency to breathe through her mouth when she sleeps.
Biogeochemistry includes the history of the great carbon reservoirs in the crust of the Earth, like limestone rocks and the coal deposits, as well as the distribution of nitrate and phosphate in the ocean.
Fluxes of Carbon between Reservoirs are depicted by the arrows, the numbers represent GtC. (From: IPCC) In the atmospheres of our sister planets, Mars and Venus, carbon dioxide is dominant. On both planets, there is more CO2 in the air than on Earth.