#carbon_dioxide__CO__carbonic_acid_gas  a heavy odorless colorless gas formed during respiration and by the decomposition of organic substances; absorbed from the air by plants in photosynthesis
  supertype:  #dioxide  an oxide containing two atoms of oxygen in the molecule
  subtype:  #chokedamp__blackdamp  the atmosphere in a mine following an explosion; high in carbon dioxide and incapable of supporting life

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