multicellular organism CARO:0000012 MH: Can't define this class based on 2 or more cells because most multi cellular organisms (if not all) have only a single cell at some point in life history. MH: sexual subtypes should probably be logically defined based on sexual processes or sex qualities. Anatomical structure that is an individual member of a clade and, at some point in its life-cycle, consists of more than one cell. cellular organism