Final answer:
Humans first appeared on Earth during the Quaternary period within the Cenozoic era.
Explanation:
Humans first appeared on Earth during the Quaternary period within the Cenozoic era. This period marks the most recent 2 million years of Earth's history and includes recognizable humans, with modern humans emerging in the Holocene epoch, which is the current epoch we are in.
Learn more about Geological Time Scale here:
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