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Evolution

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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 a hyolith

Tentacles protruding from this hyolith’s shell (illustrated) are part of a feeding organ called a lophophore, which is also found in modern horseshoe worms.

California pitcher plant

FANCY FRILLS  Scientists thought the red-veined forked frill that grows at the mouth of a California pitcher plant’s water trap was an insect lure, but now they’re not so sure.  

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