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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.

tree rings

ANTIQUE RINGS  The rings in trees buried by volcanic eruptions hundreds of millions of years ago show evidence of climate variations caused by the 11-year solar cycle, researchers report.

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.

Earth & Environment

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