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Main subject:	Any Hydrology Meteorology Agriculture Forestry (Eco)toxicology Biogeochemistry Populationdynamics
Main medium:	Any air terrestrial aquatic air+aquatic air+terrestrial terrestrial+aquatic
List of keywords:	or and (enter 2nd keyword by seperating the expressions by comma)
Model-type keywords:	not specified ----(sub-types)---- difference equations ----(sub-types)---- ordinary differential equations partial differential equations ----(sub-types)---- static-algebraic equations cellular automat petri net rule-based Markov chain Markov process individual-based Select model-type keyword from this menu 1st 2nd Select "2nd", to add a second keyword (and select from menu again.) Selected model-type keywords: or and
Level of organisation:	Any organ individual population ecosystem landscape ecosphere (not yet implemented) help
Ecosystem classification:	Any saltwater freshwater semi-terrestrial terrestrial urban (not yet implemented) help