About: http://webisa.webdatacommons.org/202404039

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Micro amounts of such elements as boron, chromium, chlorine, copper, manganese, molybdenum, selenium, silicon, sulfur, and vanadium are considered necessary to health.
http://www.w3.org/ns/prov#wasQuotedFrom	authorsden.com