Across
- 5. live in water and on land
- 8. oviparous and reliant on mother's milk
- 10. have a constant internal temperature
- 11. cannot control their body temperature
- 16. process of radical transformation
- 17. egg laying animals
- 19. embryo develops inside the mothers body
- 22. birds with webbed feet
- 23. vertebrates with gills, scales and fins
- 24. perching birds
- 25. Cartilaginous fish such as sharks
Down
- 1. term for the variety of life
- 2. have placenta that nourishes the fetus
- 3. amphibian classification of newts
- 4. mammals that only eat meat
- 6. birds with strong legs and beaks
- 7. amphibian classification of frogs
- 9. Bony fish such as perch
- 12. group of reptiles containing tortoises
- 13. group of reptiles containing geckos
- 14. contains the vocal cords
- 15. lived millions of years ago
- 18. tapered body with fins
- 20. live embryo develops in mother's pouch
- 21. eggs develop inside the mother