Across
- 6. Animals with a backbone
- 8. The father of taxonomy
- 10. Animals that lay eggs
- 11. Process by which organisms adapt
- 16. Study of reptiles and amphibians
- 17. Study of fish
- 18. Change over time in species
- 19. Scientific name system
Down
- 1. Animal that feeds on plants
- 2. Warm-blooded animals with hair
- 3. Animals without a backbone
- 4. Evolutionary relationships
- 5. Natural environment of an animal
- 7. Group of organisms that can interbreed
- 9. The study of insects
- 10. The study of birds
- 12. Study of ecosystems
- 13. The smallest unit of classification
- 14. Study of animals
- 15. Study of animal behavior