Across
- 3. absolutedating
- 5. fossil
- 6. artificialselection
- 9. ancestor
- 10. theory
- 12. massextinction
- 14. speciation
- 15. vestigialorgan
- 16. gene
Down
- 1. homologousstructures
- 2. transitionalspecies
- 4. evolution
- 7. naturalselection
- 8. adaption
- 11. mutation
- 13. charlesdarwin