Answer: Cenozoic
Notes: The Cenozoic Era, known as the "Age of Mammals," commenced 65 million years ago and still continues today. The term Cenozoic is derived from Greek words 'Ceno-' (meaning new) and 'Zoic' (meaning life). This era is significant as it witnessed the evolution of humans as well as the spread and diversification of mammals, hence the term "Age of Mammals". The era encompasses the extant periods of the Paleogene, Neogene, and Quaternary, and also includes the present day.
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