Assertion: horseshoe crab's gill | /r/HasProperty | moist
Facets:
Source sentences:
text: Horseshoe crabs swim upside down and can survive out of the water for an extended period of time if their gills are kept moist.
text: They use the gills to get oxygen from the water, but if taken out of the water they can get oxygen from air if their gills are kept moist.