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The time in which life first evolved on earth was the ___ eon.
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The time in which life first evolved on earth was the ___ eon.

User Deonclem
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Archean eon is the answer

User JeCh
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Single-celled bacteria showed up during the Archean eon. First animals such as jellyfish and starfish showed up during the Proterozoic eon. Hope this helps!
User Miek
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