Assertion: bighorn sheep's horn | /r/CapableOf | cover boney core
Facets:
Source sentences:
text: Horns are permanent and consist of a sheath of keratin (a hard protein found in fingernails and hair) covering a boney core.
text: The horns are permanent and consist of a sheath of keratin (a hard protein found in fingernails and hair) covering a boney core.