Grasses evolved during the Cretaceous Period which allowed for the establishment of widespread grassland ecosystems for dinosaurs to feed on.

Name: Grasses evolved during the Cretaceous Period which allowed for the establishment of widespread grassland ecosystems for dinosaurs to feed on.
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Grasses did evolve during the Cretaceous Period, but widespread grassland ecosystems did not become common until after the extinction of non-avian dinosaurs.

Grasses Evolved During the Cretaceous Period Which Allowed for the Establishment