Powerpoint 10 - History of Life on Earth

Powerpoint 10 - History of Life on Earth - History of life...

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History of life on Earth The history of life spans five intervals of geologic time Outline: 1. Key concepts 2. One can view the history of life as a phylogenetic tree 3. The geologic record 4. Mass extinctions 5. History of Life 6. Key Terms 7. Conclusions Key Concepts: Life originated more than 3.8 billion years ago All of the compounds necessary for life could have formed spontaneously under conditions that existed on the early Earth The history of life spans five intervals of geologic time Divergence led to two prokaryotic lineages and to the eukaryotic divergence Certain environmental insults have had profound impacts on the direction of evolution 5 intervals of geologic time: 1. The Archean Era (4600 – 2500 mya): Oxygen producing cells appear 2. The Proterozoic Era (2500 – 540 mya): The first eukaryotes appear 3. The Paleozoic Era (542 – 250 mya): The occupation of the land 4. The Mesozoic Era (250 – 65 ms): The age of reptiles 5. The Cenozoic Era (65 – today): The age of mammals Microfossils
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