in the environment and most microbes avoid wasting it.
That may not have been as much of an issue in the marine basin where the eukaryotes lived, the researchers found. Analysis of rocks surrounding the fossils indicate that the amount of oxygen in the waters where the eukaryotes lived was inconsistent. Fluctuating oxygen levels pulled phosphate from underlying sediment into the water, where it was available for mineral making. These favorable conditions plus the need for protection from predation (SN: 11/28/15,
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, p. 13) probably drove the first evolution of biomineralization,
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, Cohen said. Eventually the environment changed, and these shell-making species died out.

Solar outbursts may have supplied early Earth with the right stuff for life,
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.
Based on telescope observations of young sunlike stars,
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, researchers estimate that “super” solar flares bombarded Earth with energetic particles?at least once a day around 4 billion years ago. Collisions between the particles and molecules in Earth’s atmosphere produced nitrous oxide, a planet-warming greenhouse gas, and hydrogen cyanide,
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, a crucial component for building DNA,
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, the researchers propose May 23 in Nature Geoscience,
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.
Those chemical products warmed and fostered emerging life,
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, says study coauthor Vladimir Airapetian, an astrophysicist at NASA’s Goddard Space Flight Center in Greenbelt, Md. “Our

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