Across
- 2. spiny skin
- 5. can grow to 35cm
- 6. 4 pairs of legs
- 9. bony fish
- 11. birds
- 13. sharks and rays
- 14. jawless fish
- 15. all live in moist places or in water
Down
- 1. have a nerve cord running down their backs
- 3. create live babays
- 4. sponges
- 7. dry scaily skin
- 8. two body opening
- 10. they keep their skin moist and live near water
- 12. over 12000 species