They have two.
A "tube" is normally defined as having two openings, one at each end.
prietika
one
Three! Get off here and stop thinking about birds butts
2
alomejor no
Yes.
yes, planarians have one opening in their digestive system
The bladder has two main openings: the ureters, which are the tubes that carry urine from the kidneys to the bladder, and the urethra, which is the tube through which urine exits the body. In total, there are three openings when considering the bladder's anatomical structure: two ureteral openings and one urethral opening.
The Pharynx leads from the mouth to the esophagus and then down to the digestive tract.
has only a single openning
The digestive track is a long twisting tube from the mouth to the