Assertion: diatom | /r/CapableOf | assume their dominant role
Facets:
value: during the cretaceous period
type: TEMPORAL
value: in the carbon cycle
type: TEMPORAL
Source sentences:
text: Diatoms assumed their dominant role in the carbon cycle about 100 Myr ago, during the Cretaceous period, when atmospheric CO 2 levels were still about five times higher than they are today31 and O 2 levels were increasing30.