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yes, planarians have one opening in their digestive system
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)
Jellyfish have a simple digestive system. They have a digestive cavity with cells lining the wall that carry out the digestive function.
A digestive sac not related to other endomembrane structures
The stomach
has only a single openning
Yes
They have two.
The stomach
No.
jellyfish