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A bilateral animal has a lined gut cavity. On the other hand, animals like roundworms have a gut cavity but it is only partially lined.
acoelomate
I think it the acoelomate. Indeed it is :D
gut is in stomach and cavity is in outer region of stomach,
Some chordates have them, and in some the distinction may need to be qualified. In molluscs they remain undifferentiated, in mammals for example they differentiate into separate cavities, the pleural, peritoneal and pericardial.
No ,they lack gut but possess gastrovascular cavity .
Cnidarians have no gut in their body .The structure which performs function similar to gut is called gastrovascular cavity .
An animal whose gut has only one opening has a gastrovasuclar cavity. A Jellyfish is an example of an animal with a gastrovasuclar cavity.
The cavity of a gastrula forming a primitive gut.
A) Only one opening: they expel undigested material through the mouth.
It is a body cavity (or space) on addition to the gut/digestive system.
Peritoneal cavity