Bog The air we breathe is twenty-one percent oxygen, an amount higher than on any other known world. While we may take our air for granted, earth was not always an oxygenated planet. How did it become this way donald canfield--one of the world's leading Mærke: Donald E. Canfield Køn: eng Forsendelsesomkostninger: 39,00 kr. Leveringstid: 2-3 hverdage
