Assertion: seaweed's holdfast | /r/AtLocation | the ocean bed
Facets:
value: at depths
type: LOCATION
value: from 7 to 25 m
type: TEMPORAL
Source sentences:
text: The individual plants have a perennial “holdfast” attached to the ocean bed at depths of from 7 to 25 m, from which grow numerous gas-filled fronds spreading out at maturity to 7 m or more (Silverthorne and Sorenson 1971).