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When Did Life Appear on Earth? New Evidence Suggests It Started Shockingly Billions of Years Earlier than We Thought
The Hadean Eon—the first 500 million years of Earth’s history—left behind almost no physical record. The oldest confirmed fossils, dating back 3.5 billion years, come from Western Australia ...
PBS8y
Deep Time
The Precambrian eon is vast, almost unimaginably so. In fact, before some fossil discoveries were made ... time prior to the Cambrian period. Hadean Era (4,550-3,850 mya) The Precambrian's oldest ...
Nature3y
Major events in the evolution of amino acid synthesis
The way amino acids are synthesized has changed during the history of Earth. The Hadean eon represents the time from which Earth first formed. The subsequent Archean eon (approximately 3,500 ...