History of Earth.docx

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Biological Sciences
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Rahul Warrior

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History of Earth Macroevolution • Pattern of evolution over large time scales – Larger than species level – Same 4 mechanisms, over geologic time scale • Estimates ofAge of Earth/Solar System – Current estimate: 4.5 bya • Oceans formed by 3.8 bya • No O ,2much solar radiation • Life – 3.6 to 3.8 bya • Fossils were seen through thin film of sediments 1. Abiotic synthesis of organic molecules 2. Molecules join to form macromolecules 3. Molecules packaged into protobionts 4. Origin of self-replicating molecules • 4 Eons à 3 = “Precambrian” • Last eon = last 0.5 billion years à 3 eras – Eras represent distinct age in history of Earth and its life – Most history
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