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The body produces approximately 2.3 pounds (1.0 kg) of carbon dioxide per day per person, [72] containing 0.63 pounds (290 g) of carbon. In humans, this carbon dioxide is carried through the venous system and is breathed out through the lungs, resulting in lower concentrations in the arteries .
Scotland had more universities per capita in QS' World University Rankings' top 100 in 2012 than any other nation. [206] The country produces 1% of the world's published research with less than 0.1% of the world's population, and higher education institutions account for 9% of Scotland's service sector exports.