Carbon-based residues found in rocks near Greenland suggest that the first life forms on Earth may have arisen ____.
A)more than 3.8 billion years ago
B)at the same time as the formation of Earth
C)relatively recently - about 250,000,000 years ago
D)about 10,000 years ago

Question

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Carbon-based residues found in rocks near Greenland indicate that life forms may have arisen on Earth more than 3.8 billion years ago.

Carbon-Based Residues Found in Rocks near Greenland Suggest That the First