Chapter 1: A Universe of Life - Sierra College
A) 1.2 billion years ago. B) 3.5 billion years ago. C) 3.85 billion years ago. D) 4.0 billion years ago. E) 4.6 billion years ago. 130. Why is the claim of the discovery of microfossils controversial? A) they are found in rocks from the Hadean Eon. B) the rocks they are found in are probably contaminated by terrestrial bacteria ................
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