P*****s
发帖数: 375 | 1 Tracking distant ancestors. Geochemists added a billion years to the history
of complex cells in 1999, by finding chemical traces of eukaryotic cells--
which make up plants, fungi, and animals, including humans--in rocks 2.7
billion years old. Their discovery not only rewrites our early history, it
demonstrates the power of a promising technique that marries geochemistry
and biology and may help researchers read the most ancient chapters in the
history of life.
Scientists have argued for decades |
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