Assertion: echinoderm's foot | /r/ObjectUse | used for locomotion
Facets:
Source sentences:
text: All molluscs have three characteristics: 1) a visceral mass that is the soft-bodied portion that contains the organs; 2) a strong, muscular foot used for locomotion; and 3) the mantle, a covering that partially covers the visceral mass and secretes a shell if one is present.
text: The foot is a strong, muscular portion used for locomotion.