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Unformatted text preview: 4. the origin of the eukaryotes is unknown a) the first multicellular organism only originated 1 billion years ago! b) Chemical evidence for when eukaryotes appeared c) took about a billion years for the oxygen to build up in the atmosphere after oxidizing and forming rust d) oxygen catastrophe all the organisms were anaerobically adapted, and they weren't able to survive in the oxygenated atmosphere e) quite possibly the worst mass extinction in the earth's history! f) Some species evolved to use that oxygen, and released more energy form sugar molecules producing like 34 atp vs. 2 with anaerobic respiration...
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This note was uploaded on 12/07/2011 for the course EEMB 3 taught by Professor Carlson during the Fall '08 term at UCSB.
- Fall '08