a multicellular organism is a kind of living thing
organism is living_thing. vertebrate is multicellular_organism. multicellular_organism is living_organism. microorganism is living_organism. multicellular_protist is multicellular_organism. aerobic_organism is living_organism. multicellular_algae is multicellular_organism. single_cell_organism is living_organism. multicellular_zygote is multicellular_organism. multicellular_organism_cells is cell.