title: Towards a definition of living systems: a theory of ecological support for behavior.
abstract: It is proposed that the Darwinian theoretical approach and account of living systems has not yet been clearly given. A first approximation to this is attempted, focussing on behavior in evolving environments. A theoretical terminology is defined emphasizing the mutuality of organism and environment and the existence of biologically theoretical entities.
mesh_terms: D000818:Animals; D001522:Behavior, Animal; D005075:Biological Evolution; D004463:Ecology; D008954:Models, Biological