Assertion: coral's polyp | /r/HasProperty | living tissue
Facets:
Source sentences:
text: Coral reefs are in a constant state of flux, where new polyps (the living tissue) grow on the outer surface, while their skeleton erodes to help make the white sand for our beaches.
text: Polyps, the living portion of corals, extract calcium from seawater and combine it with carbon dioxide to construct the elaborate limestone skeletons that form the reef backbone.