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Study the timeline. 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
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Study the timeline.

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

Study the timeline. Based on fossil evidence, about how long ago did the first single-example-1
User Petertc
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4.1 billion years ago.
User Iliiaz Akhmedov
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