Assertion: hemoglobin's oxygen | /r/HasProperty | required
Facets:
value: until the discovery of anaerobic metazoa
type: TEMPORAL
value: for all complex life
type: OTHER
Source sentences:
text: Portable battery-operated pulse oximeters are useful for pilots operating in a non-pressurized aircraft above 10,000 feet (3,000 m) or 12,500 feet (3,800 m) in the U.S. where supplemental oxygen is required.
text: Until the discovery of anaerobic metazoa, oxygen was thought to be a requirement for all complex life.
text: The needs of your body’s blood oxygen may fluctuate such as during exercise when more oxygen is required or when living at higher altitudes.