Assertion: sand dollar | /r/HasAspect | a shell
Facets:
Source sentences:
text: It has a shell and tiny spines that act like feet to more around on.
text: The sand dollar has a rigid, flattened, disk-shaped test, or shell, made of firmly united plates lying just beneath the thin skin.
text: It has a shell and tiny spines that act like feet to more around on.