The oldest chemofossils are ___ Ma.

Question

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The oldest chemofossils, which are chemical compounds preserved in rocks that provide evidence of ancient life, are about 2.7 billion years old. This corresponds to the Great Oxidation Event, when oxygen began to accumulate in Earth's atmosphere due to the evolution of photosynthetic organisms. Option A) is too old, as life is thought to have emerged on Earth only around 3.5-3.8 billion years ago. Option C) is too recent, as the oldest known eukaryotic fossils date back to around 1.7 billion years ago.

The Oldest Chemofossils Are ___ Ma