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.
Definition. Carbon-storing natural feature (such as a forest or the land mass) that exchanges carbon with other reservoirs. A reservoir from which no outflow of carbon compounds takes place is called carbon sink.
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.