Match each eon or era with the appropriate characteristic or event. 1. hadean eon largest mass extinction in earth's history 2. archean eon time of the dinosaurs 3. proterozoic eon sometimes called "age of mammals" 4. phanerozoic eon toxic atmosphere; first bacteria 5. paleozoic era current eon in earth's history 6. mesozoic era formation of the solar system 7. cenozoic era buildup of oxygen; first eukaryotes