Across
- 2. mammals
- 6. fungi
- 8. insects
- 10. reptiles
- 13. embryo
- 15. virus
- 16. function of internal structure
- 17. animals
Down
- 1. classification of organisms
- 3. internal structure
- 4. bacteria
- 5. cells
- 7. birds
- 9. heredity
- 11. living organisms and environment
- 12. tissues
- 14. plants