Respuesta :
1. formation of the solar system
2. toxic atmosphere; first bacteria
3. buildup of oxygen; first eukaryotes
4. current eon in Earth's history
5. time of the dinosaurs
6. largest mass extinction in Earth's history
7. Sometimes called age of mammals
2. toxic atmosphere; first bacteria
3. buildup of oxygen; first eukaryotes
4. current eon in Earth's history
5. time of the dinosaurs
6. largest mass extinction in Earth's history
7. Sometimes called age of mammals