Assertion: elemental selenium | /r/HasProperty | essential trace element
Facets:
value: for proper nutrition
type: PURPOSE
Source sentences:
text: Elemental selenium has been said to be practically nontoxic and is considered to be an essential trace element; however, hydrogen selenide and other selenium compounds are extremely toxic, and resemble arsenic in their physiological reactions.
text: Elemental selenium is fairly nontoxic and is considered an essential trace element for proper nutrition.
text: Elemental selenium is relatively nontoxic and is considered to be an essential trace element.