Across
- 2. Where did the earliest humans live?
- 5. Does have a nucleus
- 8. The era when most plants formed and grew
- 10. How the earth was formed
- 12. The name of modern day humans
Down
- 1. Doesn't have a nucleus
- 3. The last stage of life on Earth
- 4. all living things are made up of this
- 6. First plants on Earth.
- 7. First animals on Earth
- 9. How many billion years ago did cells form?
- 11. The planet that might be the next for civilization