Assertion: dall sheep's horn | /r/MadeOf | keratin
Facets:
Source sentences:
text: Most sheep have large, curling horns that are made of keratin — the same stuff as fingernails.
text: Horns are made from keratin that makes them very strong.
text: The horns are made of keratin, the same material our fingernails are made of; growth rings on the horns, called annuli, tell us how old a sheep is.
text: Males grows horns made of keratin, and they may be as old as eight years before a full horn spiral is completed.
text: The horns are made of keratin, the same material our fingernails are made of; growth rings on the horns, called annuli, tell us how old a sheep is.
text: The horns are made of keratin, which is the same material that fingernails and hooves are made of, and is a fast growing substance.
text: Horns are made from keratin that makes them very strong.