Across
- 5. index
- 8. sympatric
- 9. evolution
- 11. trace
- 13. analogous
- 15. speciation
- 16. geographical
- 17. embryology
- 18. divergent
Down
- 1. natural
- 2. adaptive
- 3. reproductive
- 4. allopatric
- 6. homologous
- 7. genetic
- 10. convergent
- 12. temporal
- 14. evolution