Mammals became dominant in__________?
Correct answer: D. Cenozoic era
- A. Proterozoic era
- B. Mesozoic era
- C. Paleozoic era
- D. Cenozoic era
Explanation
Mammals became dominant during the Cenozoic Era after the mass extinction at the end of the Mesozoic removed the dominant non-avian dinosaurs. They originated earlier, but their major adaptive radiation and dominance occurred in the Cenozoic. Students may choose b because mammals existed in the Mesozoic, but they were not then the dominant large land animals.
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About Concept of Evolution
Evolution is the heritable change in populations over generations, driven by mutation, recombination, natural selection, genetic drift and reproductive isolation. Questions examine variation, adaptation, survival and reproduction, speciation, fossil and anatomical evidence, and the difference between individual acclimatization and evolutionary change in a population.
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