The best and most correct answer among the choices provided by the question is the fourth choice "cenozoic"
The other two are the Mesozoic and Paleozoic Eras. TheCenozoic spans only about 65 million years, from the end of the Cretaceous Period and the extinction of non-avian dinosaurs to the present. The Cenozoic is sometimes called the Age of Mammals, because the largest land animals have been mammals during that time.
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