Across
- 2. First ___ (210 mya)
- 6. First ___ (55mya)
- 7. First ___ land plants
- 10. (148 mya)
Down
- 1. first animal with hard parts
- 3. First ___ (370 mya)
- 4. Eons, ___, Periods, Epochs
- 5. Earth formed from planetary
- 8. Sail-backed
- 9. Oldest ___ like ancestors (hominids) (4 mya)