Across
- 3. large impact space stone believed to cause extinction of dinosaurs
- 4. organisms fail to survive & completely die out
- 6. dominated the Mesozoic era
- 7. period marked by appearance of first bird
- 9. era we are living in now
- 10. era in which life first appeared
- 11. period where flowering plants evolved
- 12. era known as age of the dinosaurs
Down
- 1. appeared during the Cenozoic era
- 2. model of the history of life on Earth
- 4. change of organisms over a long period of time
- 5. animals with backbone
- 8. era where 1st land plants and fish appeared