an algae is a kind of organism
algae is not aquatic_organism. multicellular_algae is multicellular_organism. seaweed is algae. green_algae is not marine_organism. marine_organism is aquatic_organism. green_algae is marine_organism. algae is aquatic_organism. multicellular_algae is algae. algae is eukaryotic_organism. algae is not eukaryotic_organism.