BIO 1130 Study Guide - Geologic Time Scale, Hadean, Rna World
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BIO 1130 Full Course Notes
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Document Summary
Consists of 4 major eons oldest one 3. 8 billion years hadean eon will last about 800million years for the planet to stabalize to form the presence of the first life forms. Presence of first life form will change the appearance of the sedimentary rocks and things that are being laid down. Archaean 1. 3 billion years the only thing that happens is life is going to live in the absence of oxygen in the ocean as bacteria (1/4 of the worlds history is anaerobic bacteria living in the ocean). Oxygen accumulates from life form that obtains high-energy electrons by the splitting of the water molecules into hydrogen (proton - drives life) and oxygen (waste). Oxygen oxidizes ocean, air and land at the end of the eon the earth rusts. Oxygen then builds up to high enough levels that we end up with prokaryotes/bacteria turning into eukaryote cells with all the organelles.
