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Scientists untangle interactions between the Earth's early life forms and the environment over 500 million years
and the chemical environment in the current Phanerozoic Eon, which began approximately 540 million years ago. At the start of the Phanerozoic, carbon dioxide levels in the atmosphere were high ...
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Historic study extends chart of life by nearly 1.5 billion years
T he Proterozoic Eon, spanning from 2,500 million to 539 million years ago, marked a transformative chapter in Earth's history.Often overshadowed by the more data-rich Phanerozoic Eon, this period ...
Nature3y
Major events in the evolution of amino acid synthesis
The Proterozoic eon was the gathering up of oxygen in Earth's atmosphere, and the Phanerozoic eon coincides with the major diversification of animals, plants, and fungi.