Assertion: sponge | /r/CapableOf | produce spongin skeletons
Facets:
Source sentences:
text: These are made from sponges that only produce spongin skeletons and do not have lots of sharp, poky spicules like most other sponges: most commercial bath sponges are made from Spongia officinalis of the Family Spongiidae that is found in the Mediterranean Sea.