Assertion: seaweed | /r/ObjectUse | used since 300 bc
Facets:
value: for medicinal benefits
type: PURPOSE
value: for its high-nutrient content
type: CAUSE
Source sentences:
text: Saltwater-dwelling red algae, a predominant type of seaweed used since 300 BC for its high-nutrient content and medicinal benefits, contains an abundance of vitamin K and calcium.