The food and drink( orginally carbon compunds) we take in are broken down into carbon compounds and most simplest being glucose (C6H12O6). When this glucose reacts with oxygen it forms carbon dioxide and water. So, this where CO2 comes from in the body. Energy is also released in the reaction which why we feel energetic after having food. This process is called cellular oxidation.
The Republic of Kiribati's Line Islands, which have a time zone of +14 hours UTC, are on the far east of the earth. These two places, therefore, have the biggest time difference of 26 hours.
