Question

Match each eon or era with the appropriate characteristic or event. 1. Hadean eon largest mass extinction in Earth's history 2. Archean eon time of the dinosaurs 3. Proterozoic eon sometimes called "Age of Mammals" 4. Phanerozoic eon toxic atmosphere; first bacteria 5. Paleozoic era current eon in Earth's history 6. Mesozoic era formation of the solar system 7. Cenozoic era buildup of oxygen; first eukaryotes

Answer 1

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 in earth’s history

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"  

Eons are types of time division which are divided into eras, which are further subdivided into periods, epochs and ages. They include the Hadean eon, the Archean eon, the Proterozoic eon and the Phanerozoic eon. The Hadean eon, the Archean eon, and the Proterozoic eon are collectively called the Precambrian supereon.

Answer 2

I think...
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"