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Approximately 3.85 billion years ago, a group of single-celled microorganisms known as __________ were alive, reproducing, and evolving.
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Approximately 3.85 billion years ago, a group of single-celled microorganisms known as __________ were alive, reproducing, and evolving.

User Ivan Melnikov
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Microbes. — cells that have a nucleus, like an amoeba or a paramecium

User Nayan Rudani
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