Assertion: coral's polyp | /r/HasProperty | retracted with stony corals
Facets:
value: by contracting muscle fibres
type: MANNER
value: in both stony and soft corals
type: OTHER
Source sentences:
text: In both stony and soft corals, the polyps can be retracted by contracting muscle fibres, with stony corals relying on their hard skeleton and cnidocytes for defence.