Assertion: hippo's ear | /r/HasAspect | strong muscular valves
Facets:
Source sentences:
text: The ears and nostrils of pygmy hippos have strong muscular valves to aid submerging underwater, and the skin physiology is dependent on the availability of water.
text: The ears and nostrils of pygmy hippos have strong muscular valves to aid submerging underwater, and the skin physiology is dependent on the availability of water.