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fossil eukaryote

OXYGEN OASIS  Oxygen was abundant enough for complex life-forms such as this 1.4-billion-year-old fossilized eukaryote to thrive around 2.3 billion years ago, new research suggests. The expansion and diversification of eukaryotes nevertheless only came hundreds of millions of years later.

illustration of Amasia

SUPERCONTINENT SUPERPUZZLE  Supercontinents come and go over the ages. Amasia, illustrated here from the North Pole, might form in the distant future.

crack in Larsen C ice shelf

A 100-meter-wide, kilometers-long rift in Antarctica’s Larsen C ice shelf, shown in this image from Nov. 10, 2016, could soon break off a 5,000-square-kilometer chunk of ice into the ocean, scientists warn.

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