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Geography, 10.12.2020 06:20 lazavionadams81

Based on fossil evidence, about how long ago did the first single-celled life form appear on Earth? 130 million years ago
1.5 billion years ago
2.5 billion years ago
4.1 billion years ago

Based on fossil evidence, about how long ago did the first single-celled life form appear on Earth?

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