Assertion: sponge's cavity | /r/HasAspect | only one opening
Facets:
value: for both ingestion
type: PURPOSE
Source sentences:
text: The gastrovascular cavity has only one opening that serves as both a mouth and an anus (an incomplete digestive system).
text: The gastrovascular cavity has only one opening, a mouth, through which the animal takes in food and releases waste.
text: The digestive cavity has only one opening for both ingestion (intake of nutrients) and egestion (removal of undigested wastes); as a result, the food cannot be processed continuously.