Assertion: cyanobacteria | /r/HasAspect | two important roles
Facets:
value: in the evolution
type: TEMPORAL
value: in biological history of the earth
type: TEMPORAL
Source sentences:
text: Cyanobacteria also have two important roles in the evolution and biological history of the earth: their photosynthetic processes contributed to the first existence of oxygen – ever – in earth’s history.