Three! Get off here and stop thinking about birds butts
many openings
They have two.
one
2
A "tube" is normally defined as having two openings, one at each end.
well first of all, DOES not do, and no they have a complete digestive system, which mean they have both a mouth and anus that are seperate
Yes.
alomejor no
yes, planarians have one opening in their digestive system
prietika
3
A gastrovascular cavity is a digestive sac with only a single opening. A complete digestive tract (otherwise known as an Alimentary canal) has two openings (a mouth and anus) between its digestive tubes unlike the gastrovascular cavity in which food is ingested and eliminated through the same opening (example would be hydra)
What do Cephalopods eat?