BIS2B Fall 2009 (Keen)Lecture 33. Evolutionary time scales25 NovemberStudents 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) oldLife has been around for a long time: ≈3.5 byFirst life was in the seas of the Hadean eonWe presume it was a bacteria-like cellThe population of early cells increased and spread