Assertion: sea urchin's mouth | /r/AtLocation | the underside of its body
Facets:
Source sentences:
text: Starfish mouth is located on the underside of its body.
text: They have tube feet and the mouth is located on the underside of the body.
text: Their mouths are found on the underside of their bodies.
text: The mouth of the sea urchin, located on the underside of its body, is named “