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Unformatted text preview: Anaerobic World (4.6 BYA) OXYGEN REVOLUTION Anaerobic Heterotrophic Bacteria Fermentation Anaerobic Photosynthetic Bacteria One Photosystem Aerobic Photosynthesis (Bluegreen "Algae") 3.5 BYA Two Photosystems & O2 released Aerobic World (<2.5 BYA) Krebs Cycle evolved, ozone layer developed, land could be occupied Eukaryotes Evolved No oxygen in the atmosphere; No ozone layer, UV radiation bombards earth Organic Soup Origin of Life PROTISTA
The first Eukaryotes Problems for Protista Who are the Protista? Where did they come from? How did their structures evolve? How did sex evolve?...
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