| Questions | Answers |
|---|---|
| how many years ago was the earth created? | 4.567 billion years ago |
| The first early organisms with cells appeared | 2.16 billion years ago |
| The cambrian explosion happened | 545 million years ago |
| The 1st mass extinction happened | 251 million years ago |
| Early mammals and the first dinosaurs happened | 220 million years ago |
| early flowering plants arrived | 130 million years ago |
| Dinosaurs became extinct | 65 million years ago |