Assertion: sponge's skeleton | /r/HasProperty | calcium carbonate
Facets:
value: entirely
type: DEGREE
Source sentences:
text: Porifera Skeleton - Porifera Body is supported by a skeleton provided by spicules, composed of calcium carbonate or silicon.
text: Calcareous sponges have a mineral skeleton composed entirely of calcium carbonate, consisting of free, rarely linked or cemented, diactine, triactine, tetractine and/or polyactinal spicules, to which can be added a solid basal calcitic skeleton.