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Lec 33 2B F09 - BIS2B Fall 2009(Keen Lecture 33...

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BIS2B Fall 2009 (Keen) Lecture 33 . Evolutionary time scales 25 November Students should be able to: Explain the relationship between speciation events and the tree of life. Explain the relationship between lineage splitting and classification. Explain how the idea of successive change is shown on a cladogram. Give an example of an ancient and a modern symbiosis.
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The Earth is old: 4.5 billion years (by) old Life has been around for a long time: 3.5 by First life was in the seas of the Hadean eon We presume it was a bacteria-like cell The population of early cells increased and spread
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