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How long is the Cenozoic era compared with Earth’s entire history?
a. Less than 2% of Earth's history
b. About one quarter (25%) of Earth's history
c. More than 90% of Earth's history
Cenozoic Era, third of the major eras of Earth ’s history, beginning about 66 million years ago and extending to the present 2. Cenozoic (66 million years ago until today) means ‘recent life.’ During this era, plants and animals look most like those on Earth today
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