Assertion: sponge's skeleton | /r/HasProperty | porous
Facets:
Source sentences:
text: Sponges characteristically have a porous skeleton, usually containing an intricate system of canals, that is composed of fibrous material or siliceous or calcareous spicules.
text: Sponges characteristically have a porous skeleton, usually containing an intricate system of canals, that is composed of fibrous material or siliceous or calcareous spicules.