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atmospheric gases, especially carbon dioxide, methane, nitrous oxide, ozone and water vapour, which trap heat energy in the atmosphere.
the blood vessel that carries blood from the digestive tract to the liver.
a group or category in the biological classification system (the plural of taxon is taxa).
the second set of teeth formed in mammals. In humans there are thirty-two permanent teeth.
a state in which the body has become dependent on a chemical substance in order to function.