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Researchers discover new wrinkle in ancient ocean chemistry（图）
new wrinkle ancient ocean chemistry
2009/12/23
Scientists widely accept that around 2.4 billion years ago, the Earth's atmosphere underwent a dramatic change when oxygen levels rose sharply. Called the "Great Oxidation Event" (GOE), the oxygen sp...
The Ediacaran Period (635-542 million years ago) was a
time of fundamental environmental and evolutionary
change, culminating in the first appearance of
macroscopic animals. Here we present a de...