Biology, 17.03.2021 23:40 Jasten

About how long ago did the first single-celled life form appear on Earth? A. 130 million years ago
B. 1.5 billion years ago
C. 2.5 billion years ago
D. 4.1 billion years ago

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About how long ago did the first single-celled life form appear on Earth? A. 130 million years ago<...