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The organisms that produced the oxygen gas in Earth's atmosphere in ancient times were
Quaternary
The most recent period in the Earth's history, starting around 2.58 million years ago and continuing to the present day.
Cenozoic
The current geological era, beginning about 66 million years ago, characterized by the dominant emergence of mammals.
Holocene
The current geological epoch, which started approximately 11,700 years ago after the last major ice age.
Carbon Dating
A method used to determine the age of an artifact or remains by measuring the amount of carbon-14 present, which decays over time.
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