(Kelly of the Clue Crew shows an anatomical diagram on the monitor.)  It's the 2-word term for the continuous anatomical system that contains the kidneys, the ureters, the bladder & the urethra
In plants, 
none known at this Certain cells in sense organs, ... fatty tissues, liver, gall 
bladder, animals, specific components ... ureters, urethra, rectum, anus, coded 
information processing, ....