Assertion: shark's sens | /r/HasProperty | keen
Facets:
Source sentences:
text: Sharks will use their keen senses to track down prey.
text: Sharks have keen olfactory senses, located in the short duct (which is not fused, unlike bony fish) between the anterior and posterior nasal openings, with some species able to detect as little as one part per million of blood in seawater.
text: Sharks will use their keen senses to track down prey.