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Guest
1. Hadean eon
2. Archean eon
3. Proterozoic eon
4. Phanerozoic eon
5. Paleozoic era
6. Mesozoic era
7. Cenozoic era
to
A. toxic atmosphere; first bacteria
B. buildup of oxygen; first eukaryotes\
C. formation of the solar system
D. sometimes called "Age of Mammals"\
E. time of the dinosaurs
F. largest mass extinction in Earth's history
G. current eon
2. Archean eon
3. Proterozoic eon
4. Phanerozoic eon
5. Paleozoic era
6. Mesozoic era
7. Cenozoic era
to
A. toxic atmosphere; first bacteria
B. buildup of oxygen; first eukaryotes\
C. formation of the solar system
D. sometimes called "Age of Mammals"\
E. time of the dinosaurs
F. largest mass extinction in Earth's history
G. current eon