Across
- 2. group of vertebrates that include snakes and lizards
- 5. cold-blooded vertebrates
- 6. eating food and using it for metabolism and growth
- 7. group of animals without backbone
- 9. a group of warm-blooded vertebrates
- 11. the act of breathing
- 12. category of living organisms
Down
- 1. changes in animals over time, dicovered by Darwin
- 3. group of animals that share the same characteristics
- 4. microorganism that can cause illness
- 8. a characteristic of an organism, often caused by genes
- 10. a vertebrate with gills