Assertion: sponge's spicule | /r/CapableOf | form the skeletonof many sponges
Facets:
Source sentences:
text: Spicules form the "skeleton" of many sponges.
text: Sclerocytes secrete the mineralized spicules ("little spines") that form the skeletons of many sponges and in some species provide some defense against predators.