Assertion: sea cucumber | /r/HasProperty | unique
Facets:
value: among echinoderms
type: OTHER
value: in their capacity
type: OTHER
Source sentences:
text: Sea cucumbers are unique among echinoderms in not having a hardened calcium exoskeleton, and in their capacity to regenerate damaged or lost body parts and viscera to a much greater extent than sea urchins or sea stars.