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					| Introduction and Overview |  
					| Lecture 1 1/28/98
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					| |  | Discussing the 4 billion year history of Life on Earth | 
 |  | Impact of life on the planet | 
 |  | Impact of the planet on life | 
 |  | Why is the "History of Life" a geology class? | 
 |  | Geologists have the record | 
 |  | The history of the Earth is recorded in its rocks. | 
 |  | The history of life is also recorded there. | 
 |  | The earth and life have evolved together and molded each other | 
 |  | The history of life is inseparable from the history of the Earth | 
 |  | The Earth would be a very different place without life | 
 |  | Changes to the Earth have greatly affected life on it | 
 |  | An example of this co-evolution | 
 |  | Earth's early atmosphere was quite different from today's | 
 |  | It evolved to its present composition because of life | 
 |  | Increasing oxygen level were poisonous to early life | 
 |  | Mutations that allowed bacteria to live in this increasingly poisonous environment were selected for | 
 |  | Oxygen in the atmosphere lead to formation of ozone Layer | 
 |  | How do we reconstruct the history of life from the geologic record | 
 |  | What are the tools that we use? | 
 |  | What is the History of Life | 
 
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