#trophobiosis  a symbiotic relation is which one organism protects the other in return for some kind of food product
  supertype:  #symbiosis__symbiosi__mutualism  the relation between two different species of organisms that are interdependent; each gains benefits from the other
     supertype:  #interdependence__mutuality__interdependency  a reciprocal relation between interdependent entities (objects or individuals or groups)
        supertype:  #reciprocality__reciprocity  a relation of mutual dependence or action or influence
           supertype:  #relation  an abstraction belonging to or characteristic of two entities or parts together
              supertype:  pm#thing_that_can_be_seen_as_a_relation  usable as relation type
                 supertype:  pm#thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
                    supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

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