Match each eon and era with the appropriate characteristics or event.

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'';

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