The organelles they use for anaerobic respiration are found in other unicellular eukaryotes (single-celled organisms that aren't bacteria, like some fungal path

The organelles they use for anaerobic respiration are found in other unicellular eukaryotes (single-celled organisms that aren't bacteria, like some fungal pathogens). The interesting thing here is that they're multicellular, not that their cellular biochemistry is unique.