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© May 2005 Lorentz JÄNTSCHI && Sorana Daniela BOLBOACĂ

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 G03 Environment and Public Health D004778 +
  G03.230 Environment D004777 +
   G03.230.124 Ecosystem D017753 +
     G03.230.124.240 Ecological Systems, Closed D018504 
     G03.230.124.100 Biomass D018533 
     G03.230.124.250 Food Chain D020387 
     G03.230.124.049 Biodiversity D044822