Assertion: narwhal | /r/CapableOf | reduce surface area
Facets:
Source sentences:
text: Narwhals do not have a dorsal fin, possibly an evolutionary adaptation to swimming easily under ice, to facilitate rolling, or to reduce surface area and heat loss.
text: Narwhals do not have a dorsal fin, possibly an evolutionary adaptation to swimming easily under ice, to facilitate rolling, or to reduce surface area and heat loss.