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Identify the eon during which the oldest microfossils occurred

User Scrimothy
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Answer: It was early in the Archean that life first appeared on Earth. Our oldest fossils date to roughly 3.5 billion years ago, and consist of bacteria microfossils. In fact, all life during the more than one billion years of the Archean was bacterial.

Step-by-step explanation:

User Extraneon
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