Assertion: hemoglobin's oxygen | /r/HasProperty | reactive
Facets:
value: highly
type: DEGREE
value: to remain
type: PURPOSE
value: too chemically
type: MANNER
Source sentences:
text: Oxygen is too chemically reactive to remain a free element in air without being continuously replenished by the photosynthetic action of living organisms.
text: Oxygen is a highly reactive substance and must be segregated from combustible materials.