Assertion: sea urchin | /r/HasProperty | ball-shaped echinoderm
Facets:
Source sentences:
text: A sea urchin is a ball-shaped echinoderm with long, pointy, and moveable spines all over its body.
text: Sea Urchin worksheets that are perfect for teaching students about a sea urchin which is a ball-shaped echinoderm with long, pointy, and moveable spines all over its body.