Assertion: alligator's jaw | /r/HasProperty | upper
Facets:
Source sentences:
text: This is because an alligator’s upper jaw has small sockets on the inside that the teeth slot into when its mouth is closed.
text: Their upper jaw is wider than the lower jaw, overlapping it.
text: Alligators have a large fourth tooth in their lower jaw that fits inside their upper jaw when they close their mouths; with crocodiles, these teeth are visible when their mouths are closed.