a unicellular organism has one cell
single_celled_haploid_organism is single_cell_organism. unicellular_algae is single_cell_organism. single_cell_organism is living_organism. single_cell_organism is cell. unicellular_protist is protista. single_cell_diploid_organism is spatial_thing. unicellular_organism_reproduction_event is cellular_multiplication. unicellular_protist is single_cell_organism. unicellular_algae is algae. unicellular_organism_reproduction_event is organism_reproduction_event.