Assertion: bacteria | /r/CapableOf | serve as food
Facets:
value: for higher animals
type: TRANSITIVE-OBJECT
value: for other microbes
type: TRANSITIVE-OBJECT
value: for several billion years
type: TEMPORAL
Source sentences:
text: For several billion years, bacteria, algae, and other microorganisms served as food for other microbes and for higher animals as they evolved.