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Earth’s global temperature has drastically changed over the last 500 million years
The Phanerozoic Eon began around 540 million years ago ... cooler than much of the Phanerozoic era. However, human-induced ...
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Historic study extends chart of life by nearly 1.5 billion years
Often overshadowed by the more data-rich Phanerozoic Eon, this period was characterized ... by low species turnover rates. Unlike later eras, Proterozoic life was smaller, softer, and less likely ...