Assertion: echinoderm's arm | /r/HasProperty | jointed
Facets:
Source sentences:
text: The arms of brittlestars are flexible and appear jointed because of the conspicuous plates of the outer surface.
text: The arms of brittlestars are flexible and appear jointed because of the conspicuous plates of the outer surface.
text: The arms of brittlestars are flexible and appear jointed because of the conspicuous plates of the outer surface.