if an organism survives competition for resources then this organism will survive / reproduce for natural selection
surviving is economic_occurrence. mortal_species_survives_must has method_for_reproduction if survive occurs then recuperate occurs. mortal_species_survives_must has not method_for_reproduction natural_selection is evolutionary_theory. humans has competitive_nature multicellular_organism_reproduction_event is not organism_reproduction_event. if survive does not occur then recuperate occurs. natural_selection is not evolutionary_theory. surviving is not economic_occurrence.