Assertion: sea urchin's habitat | /r/HasAspect | demersal
Facets:
value: above the seabed
type: LOCATION
value: alternatively
type: DEGREE
value: vertically
type: MANNER
Source sentences:
text: Alternatively, marine habitats can be divided vertically into pelagic (open water), demersal (just above the seabed) and benthic (sea bottom) habitats.