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The search for life on Mars or on icy moons such as Europa and Enceladus may capture more attention, but another major astrobiology mystery is much closer to home. Scientists are still trying to understand when the first eukaryotes appeared on Earth and how those organisms helped set the stage for complex life.
That question matters because microbial organisms dominated Earth for roughly 90 percent of the planet's history. Reconstructing the transition from a ...
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