Assertion: dolphin's blowhole | /r/HasAspect | flap
Facets:
Source sentences:
text: The single blowhole on top of their head has a flap that opens to reveal a pair of nostrils, which dolphins use for breathing when they surface.
text: The single blowhole on top of their head has a flap that opens to reveal a pair of nostrils, which dolphins use for breathing when they surface.