Across
- 3. naming and classification
- 5. grasses
- 9. birds
- 13. worms
- 14. trees
- 15. reptiles and amphibians
- 17. shelled animals
- 18. algae
- 19. external and internal structure
Down
- 1. heredity and variations
- 2. tissues
- 4. fossils
- 6. insects
- 7. functional processes
- 8. form
- 10. liverworts, hornworts
- 11. microorganisms
- 12. distribution
- 16. interrelationships of organisms and their environment
- 17. cells