Match each eon or era with the appropriate characteristic or event. 1. Largest mass extinction in Earth's history 2. Toxic atmosphere; first bacteria 3. Sometimes called "Age of Mammals" 4. Buildup of oxygen; first eukaryotes 5. Current eon 6. Time of the dinosaurs 7. Formation of the solar systema. Archean eonb. Mesozoic erac. Phanerozoic eond. Proterozoic eone. Hadean eonf. Cenozoic erag. Paleozoic era

Match each eon or era with the appropriate characteristic or event.

The eon

a. Archean eon b. Mesozoic era c. Phanerozoic eon d. Proterozoic eon e. Hadean eon f. Cenozoic era g. Paleozoic era

1. Largest mass extinction in Earth's history : g. Paleozoic era

2. Toxic atmosphere; first bacteria : a. Archean eon

3. Sometimes called "Age of Mammals" : f. Cenozoic era

4. Buildup of oxygen; first eukaryotes : d. Proterozoic eon

5. Current eon : c. Phanerozoic eon

6. Time of the dinosaurs: b. Mesozoic era

7. Formation of the solar system: e. Hadean eon