Assertion: jellyfish's opening | /r/HasProperty | mouth
Facets:
Source sentences:
text: The gastrovascular cavity has only one opening, a mouth, through which the animal takes in food and releases waste.
text: They lack cephalization (concentration of sensory organs in a head), their bodies have two cell layers rather than the three of so-called higher animals, and the saclike coelenteron has one opening (the mouth).