Catastrophic destructions, like the one caused by the impact of a bolide with earth at the end of the Cretaceous, create opportunities for new types of biological associations. In the case of the end-Cretaceous catastrophe:
A) mammals and birds filled ecological vacancies left by dinosaurs.
B) ammonites filled ecological vacancies left by trilobites.
C) conifers filled ecological vacancies left by large primitive trees and ferns.
D) humans quickly became the dominant species on the planet.
Ans: A) mammals and birds filled ecological vacancies left by dinosaurs.
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