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Coolguy80 Coolguy80
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4 weeks ago

When did the first single-celled organisms evolve on Earth?



longer than 4.6 billion years ago



between 4.6 and 3.4 billion years ago



between 3.4 and 1.2 billion years ago



Between 1.2 billion years ago and 500 million years ago

Textbook 
ASTRO

ASTRO


Edition: 3rd
Authors:
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gamblawcgamblawc
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4 weeks ago
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