Answer:
Presence of chitinous cell walls
Explanation:
All the prokaryotes are single cellular and some eukaryotes are also single cellular so if several single cellular organisms are presented than by identifying the cell wall compositions we can find out that from which group the organism belongs.
Fungi are different from bacteria and archaea. Bacteria have a cell wall made up of peptidoglycan, in the archaea cell wall is made up of pseudo-peptidoglycan.
Fungi are eukaryotes and their cell membrane is covered by a cell wall made up of chitin. They can be single cellular or multicellular. So chitinous cell wall is the unique feature that helps us identify the fungus.
