The correct matches are:
1. Hadean eon - Formation of the Solar System;
2. Archean eon - Toxic atmosphere; first bacteria;
3. Proterozoic eon - buildup of oxygen; first eukaryotes;
4. Phanerozoic eon - Current eon;
5. Paleozoic era - Largest mass extinction in Earth's history;
6. Mesozoic era - Time of the dinosaurs;
7. Cenozoic era - Sometimes called ''Age of Mammals'';
