Solve this multiple-choice question and choose the correct option.

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Geological eras (Cenozoic): Which event characterizes the Cenozoic era? Think of biotic dominance and orogeny after the Mesozoic.

Difficulty: Easy

Rise and diversification of mammals (including the appearance of humans)
Origin and radiation of dinosaurs
Formation of the Gondwana supercontinent
Widespread trilobites and first fishes

Correct Answer: Rise and diversification of mammals (including the appearance of humans)

Explanation:

Concept/ApproachThe Cenozoic (66 Ma–present) is marked by mammalian radiation, angiosperm dominance, Himalayan uplift, and ultimately human evolution. Dinosaurs dominated the preceding Mesozoic; Gondwana assembly and trilobite abundance are Paleozoic features.

Final AnswerRise and diversification of mammals (including the appearance of humans)

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